Lazy Generics

- Instead of performing lazy lookups at individual use sites, perform a single lazy lookup to get a dictionary, and then use normal canonical lookups from there
- Shares logic with USG dictionary acquisition, and with normal canonical codegen
- Add LazyGenericPolicy nob to CoreRT environment to control policy

Universal Shared Generics Changes
- Fixup EETypeNode generation for USG types
- Consider TemplateTypeLayout necessary for all universal generic canon types
- Use RhAllocLocal2 which returns a byref to the first field of the "local" object instead of the start of the object.
- Tweak USG field invoke map generation to not stop compilation. Still needs to be implemented.

[tfs-changeset: 1658670]

1 files changed, 19 insertions, 0 deletions

diff --git a/src/Runtime.Base/src/System/Runtime/RuntimeExports.cs b/src/Runtime.Base/src/System/Runtime/RuntimeExports.cs
index eb5c5e432..3c8868bf5 100644
--- a/src/Runtime.Base/src/System/Runtime/RuntimeExports.cs
+++ b/src/Runtime.Base/src/System/Runtime/RuntimeExports.cs
@@ -270,6 +270,25 @@ namespace System.Runtime
                 return new Wrapper();
         }
 
+        // RhAllocLocal2 helper returns the pointer to the data region directly
+        // instead of relying on the code generator to offset the local by the 
+        // size of a pointer to get the data region.
+        [RuntimeExport("RhAllocLocal2")]
+        public static unsafe ref byte RhAllocLocal2(EETypePtr pEEType)
+        {
+            EEType* ptrEEType = (EEType*)pEEType.ToPointer();
+            if (ptrEEType->IsValueType)
+            {
+#if FEATURE_64BIT_ALIGNMENT
+                if (ptrEEType->RequiresAlign8)
+                    return ref InternalCalls.RhpNewFastMisalign(ptrEEType).GetRawData();
+#endif
+                return ref InternalCalls.RhpNewFast(ptrEEType).GetRawData();
+            }
+            else
+                return ref new Wrapper().GetRawData();
+        }
+
         [RuntimeExport("RhMemberwiseClone")]
         public static unsafe object RhMemberwiseClone(object src)
         {