Improve live variable JitDump output (#54256)

The variable live range output is unnecessarily verbose. Simplify it; clean it up;
make it smaller; use standard dumpers.

Example, before:
```
////////////////////////////////////////
////////////////////////////////////////
Variable Live Range History Dump for Block 2
IL Var Num 0:
[rcx [ (G_M13669_IG02,ins#0,ofs#0), (G_M13669_IG03,ins#1,ofs#2) ]; rbp[16] (1 slot) [ (G_M13669_IG03,ins#1,ofs#2), NON_CLOSED_RANGE ]; ]
IL Var Num 1:
[rsi [ (G_M13669_IG03,ins#1,ofs#2), NON_CLOSED_RANGE ]; ]
////////////////////////////////////////
////////////////////////////////////////
End Generating code for Block 2
```
After:
```
Variable Live Range History Dump for BB02
V00 this: rcx [(G_M13669_IG02,ins#0,ofs#0), (G_M13669_IG03,ins#1,ofs#2)]; rbp[16] (1 slot) [(G_M13669_IG03,ins#1,ofs#2), ...]
V01 loc0: rsi [(G_M13669_IG03,ins#1,ofs#2), ...]
```

And the end-of-dump output, before:
```
////////////////////////////////////////
////////////////////////////////////////
PRINTING VARIABLE LIVE RANGES:
IL Var Num 0:
[rsi [18 , B5 )rsi [100 , 13A )rsi [14D , 186 )rsi [196 , 1C5 )rsi [1E3 , 271 )rsi [280 , 285 )]
IL Var Num 1:
[rdi [18 , B9 )rdi [100 , 137 )rdi [14D , 184 )rdi [196 , 1C2 )rdi [1E3 , 271 )rdi [280 , 288 )]
IL Var Num 2:
[rbx [18 , CA )rbx [100 , 10D )rbx [14D , 15A )rbx [196 , 1C7 )rbx [1E3 , 271 )rbx [280 , 28B )]
IL Var Num 3:
[rbp [3A , F0 )rbp [100 , 141 )rbp [14D , 18C )rbp [196 , 1D6 )rbp [1E3 , 275 )]
IL Var Num 4:
[r14 [3E , EC )r14 [100 , 13D )r14 [14D , 188 )r14 [196 , 1D2 )r14 [1E3 , 271 )]
IL Var Num 5:
[rcx [22A , 263 )]
////////////////////////////////////////
////////////////////////////////////////
```
After:
```
VARIABLE LIVE RANGES:
V00 arg0: rsi [18, B5); rsi [100, 13A); rsi [14D, 186); rsi [196, 1C5); rsi [1E3, 271); rsi [280, 285)
V01 arg1: rdi [18, B9); rdi [100, 137); rdi [14D, 184); rdi [196, 1C2); rdi [1E3, 271); rdi [280, 288)
V02 arg2: rbx [18, CA); rbx [100, 10D); rbx [14D, 15A); rbx [196, 1C7); rbx [1E3, 271); rbx [280, 28B)
V03 loc0: rbp [3A, F0); rbp [100, 141); rbp [14D, 18C); rbp [196, 1D6); rbp [1E3, 275)
V04 loc1: r14 [3E, EC); r14 [100, 13D); r14 [14D, 188); r14 [196, 1D2); r14 [1E3, 271)
V05 loc2: rcx [22A, 263)
```

1 files changed, 51 insertions, 58 deletions

diff --git a/src/coreclr/jit/codegencommon.cpp b/src/coreclr/jit/codegencommon.cpp
index b6ed8c9ea99..f977ddfe6f3 100644
--- a/src/coreclr/jit/codegencommon.cpp
+++ b/src/coreclr/jit/codegencommon.cpp
@@ -11700,7 +11700,8 @@ void CodeGenInterface::VariableLiveKeeper::VariableLiveRange::dumpVariableLiveRa
     const CodeGenInterface* codeGen) const
 {
     codeGen->dumpSiVarLoc(&m_VarLocation);
-    printf(" [ ");
+
+    printf(" [");
     m_StartEmitLocation.Print(codeGen->GetCompiler()->compMethodID);
     printf(", ");
     if (m_EndEmitLocation.Valid())
@@ -11709,9 +11710,9 @@ void CodeGenInterface::VariableLiveKeeper::VariableLiveRange::dumpVariableLiveRa
     }
     else
     {
-        printf("NON_CLOSED_RANGE");
+        printf("...");
     }
-    printf(" ]; ");
+    printf("]");
 }
 
 // Dump "VariableLiveRange" when code has been generated and we have the assembly native offset of each "emitLocation"
@@ -11727,7 +11728,7 @@ void CodeGenInterface::VariableLiveKeeper::VariableLiveRange::dumpVariableLiveRa
     // If this is an open "VariableLiveRange", "m_EndEmitLocation" is non-valid and print -1
     UNATIVE_OFFSET endAssemblyOffset = m_EndEmitLocation.Valid() ? m_EndEmitLocation.CodeOffset(emit) : -1;
 
-    printf(" [%X , %X )", m_StartEmitLocation.CodeOffset(emit), m_EndEmitLocation.CodeOffset(emit));
+    printf(" [%X, %X)", m_StartEmitLocation.CodeOffset(emit), m_EndEmitLocation.CodeOffset(emit));
 }
 
 //------------------------------------------------------------------------
@@ -11971,25 +11972,31 @@ void CodeGenInterface::VariableLiveKeeper::VariableLiveDescriptor::updateLiveRan
 void CodeGenInterface::VariableLiveKeeper::VariableLiveDescriptor::dumpAllRegisterLiveRangesForBlock(
     emitter* emit, const CodeGenInterface* codeGen) const
 {
-    printf("[");
+    bool first = true;
     for (LiveRangeListIterator it = m_VariableLiveRanges->begin(); it != m_VariableLiveRanges->end(); it++)
     {
+        if (!first)
+        {
+            printf("; ");
+        }
         it->dumpVariableLiveRange(emit, codeGen);
+        first = false;
     }
-    printf("]\n");
 }
 
 void CodeGenInterface::VariableLiveKeeper::VariableLiveDescriptor::dumpRegisterLiveRangesForBlockBeforeCodeGenerated(
     const CodeGenInterface* codeGen) const
 {
-    noway_assert(codeGen != nullptr);
-
-    printf("[");
+    bool first = true;
     for (LiveRangeListIterator it = m_VariableLifeBarrier->getStartForDump(); it != m_VariableLiveRanges->end(); it++)
     {
+        if (!first)
+        {
+            printf("; ");
+        }
         it->dumpVariableLiveRange(codeGen);
+        first = false;
     }
-    printf("]\n");
 }
 
 // Returns true if a live range for this variable has been recorded
@@ -12428,41 +12435,33 @@ void CodeGenInterface::VariableLiveKeeper::psiClosePrologVariableRanges()
 #ifdef DEBUG
 void CodeGenInterface::VariableLiveKeeper::dumpBlockVariableLiveRanges(const BasicBlock* block)
 {
-    // "block" will be dereferenced
-    noway_assert(block != nullptr);
+    assert(block != nullptr);
 
     bool hasDumpedHistory = false;
 
-    if (m_Compiler->verbose)
-    {
-        printf("////////////////////////////////////////\n");
-        printf("////////////////////////////////////////\n");
-        printf("Variable Live Range History Dump for Block %d \n", block->bbNum);
+    printf("\nVariable Live Range History Dump for " FMT_BB "\n", block->bbNum);
 
-        if (m_Compiler->opts.compDbgInfo)
+    if (m_Compiler->opts.compDbgInfo)
+    {
+        for (unsigned int varNum = 0; varNum < m_LiveDscCount; varNum++)
         {
-            for (unsigned int varNum = 0; varNum < m_LiveDscCount; varNum++)
-            {
-                VariableLiveDescriptor* varLiveDsc = m_vlrLiveDsc + varNum;
+            VariableLiveDescriptor* varLiveDsc = m_vlrLiveDsc + varNum;
 
-                if (varLiveDsc->hasVarLiveRangesFromLastBlockToDump())
-                {
-                    hasDumpedHistory = true;
-                    printf("IL Var Num %d:\n", m_Compiler->compMap2ILvarNum(varNum));
-                    varLiveDsc->dumpRegisterLiveRangesForBlockBeforeCodeGenerated(m_Compiler->codeGen);
-                    varLiveDsc->endBlockLiveRanges();
-                }
+            if (varLiveDsc->hasVarLiveRangesFromLastBlockToDump())
+            {
+                hasDumpedHistory = true;
+                m_Compiler->gtDispLclVar(varNum, false);
+                printf(": ");
+                varLiveDsc->dumpRegisterLiveRangesForBlockBeforeCodeGenerated(m_Compiler->codeGen);
+                varLiveDsc->endBlockLiveRanges();
+                printf("\n");
             }
         }
+    }
 
-        if (!hasDumpedHistory)
-        {
-            printf("..None..\n");
-        }
-
-        printf("////////////////////////////////////////\n");
-        printf("////////////////////////////////////////\n");
-        printf("End Generating code for Block %d \n", block->bbNum);
+    if (!hasDumpedHistory)
+    {
+        printf("..None..\n");
     }
 }
 
@@ -12470,34 +12469,28 @@ void CodeGenInterface::VariableLiveKeeper::dumpLvaVariableLiveRanges() const
 {
     bool hasDumpedHistory = false;
 
-    if (m_Compiler->verbose)
-    {
-        printf("////////////////////////////////////////\n");
-        printf("////////////////////////////////////////\n");
-        printf("PRINTING VARIABLE LIVE RANGES:\n");
+    printf("VARIABLE LIVE RANGES:\n");
 
-        if (m_Compiler->opts.compDbgInfo)
+    if (m_Compiler->opts.compDbgInfo)
+    {
+        for (unsigned int varNum = 0; varNum < m_LiveDscCount; varNum++)
         {
-            for (unsigned int varNum = 0; varNum < m_LiveDscCount; varNum++)
-            {
-                VariableLiveDescriptor* varLiveDsc = m_vlrLiveDsc + varNum;
+            VariableLiveDescriptor* varLiveDsc = m_vlrLiveDsc + varNum;
 
-                if (varLiveDsc->hasVarLiveRangesToDump())
-                {
-                    hasDumpedHistory = true;
-                    printf("IL Var Num %d:\n", m_Compiler->compMap2ILvarNum(varNum));
-                    varLiveDsc->dumpAllRegisterLiveRangesForBlock(m_Compiler->GetEmitter(), m_Compiler->codeGen);
-                }
+            if (varLiveDsc->hasVarLiveRangesToDump())
+            {
+                hasDumpedHistory = true;
+                m_Compiler->gtDispLclVar(varNum, false);
+                printf(": ");
+                varLiveDsc->dumpAllRegisterLiveRangesForBlock(m_Compiler->GetEmitter(), m_Compiler->codeGen);
+                printf("\n");
             }
         }
+    }
 
-        if (!hasDumpedHistory)
-        {
-            printf("..None..\n");
-        }
-
-        printf("////////////////////////////////////////\n");
-        printf("////////////////////////////////////////\n");
+    if (!hasDumpedHistory)
+    {
+        printf("..None..\n");
     }
 }
 #endif // DEBUG