Fix more CoreFx on ILC tests (#3547)

A bunch of one-bucket items combined into one commit
for efficiency...

- Port over new Array.Copy behavior 
    https://github.com/dotnet/coreclr/pull/11266

- Fix initial value for AssemblyName.VersionCompatibility

- Enforce the traditional restrictions on stacking ByRefs and stacking
  Pointers on ByRefs.

- Remove the restriction on GetTypeFromCLSID().MakeArrayType()
  (https://github.com/dotnet/corert/issues/3522)

- Allow IsAssignable() to take a TypeDelegator (or anything
  else that wraps a runtime type.)

2 files changed, 2 insertions, 5 deletions

diff --git a/src/System.Private.CoreLib/src/System/Array.CoreRT.cs b/src/System.Private.CoreLib/src/System/Array.CoreRT.cs
index a6f7e2421..885b6a89b 100644
--- a/src/System.Private.CoreLib/src/System/Array.CoreRT.cs
+++ b/src/System.Private.CoreLib/src/System/Array.CoreRT.cs
@@ -602,11 +602,7 @@ namespace System
             nuint srcElementSize = sourceArray.ElementSize;
             nuint destElementSize = destinationArray.ElementSize;
 
-            // Compat: Why this asymmetrical treatment of enums?
-            if (destinationElementEEType.IsEnum)
-                throw new ArrayTypeMismatchException(SR.ArrayTypeMismatch_CantAssignType);
-
-            if (sourceElementEEType.IsEnum && sourceElementType != destElementType)
+            if ((sourceElementEEType.IsEnum || destinationElementEEType.IsEnum) && sourceElementType != destElementType)
                 throw new ArrayTypeMismatchException(SR.ArrayTypeMismatch_CantAssignType);
 
             if (reliable)
diff --git a/src/System.Private.CoreLib/src/System/Reflection/AssemblyName.cs b/src/System.Private.CoreLib/src/System/Reflection/AssemblyName.cs
index 561d3a538..d55c2f9d4 100644
--- a/src/System.Private.CoreLib/src/System/Reflection/AssemblyName.cs
+++ b/src/System.Private.CoreLib/src/System/Reflection/AssemblyName.cs
@@ -21,6 +21,7 @@ namespace System.Reflection
         }
 
         public AssemblyName(string assemblyName)
+            : this()
         {
             if (assemblyName == null)
                 throw new ArgumentNullException(nameof(assemblyName));