Update custom attribute metadata schema to support enum arrays as element of object arrays

Four things:

* The actual schema update
* Update the CoreRT metadata emitter to emit the new schema
* Update the Project N metadata emitter to emit the new schema
* Update reflection codebase to read the new schema

Fixes dotnet/corert#3328.

[tfs-changeset: 1654618]

1 files changed, 11 insertions, 1 deletions

diff --git a/src/ILCompiler.MetadataTransform/src/ILCompiler/Metadata/Transform.CustomAttribute.cs b/src/ILCompiler.MetadataTransform/src/ILCompiler/Metadata/Transform.CustomAttribute.cs
index 9e74138dc..ecf9532e7 100644
--- a/src/ILCompiler.MetadataTransform/src/ILCompiler/Metadata/Transform.CustomAttribute.cs
+++ b/src/ILCompiler.MetadataTransform/src/ILCompiler/Metadata/Transform.CustomAttribute.cs
@@ -147,7 +147,17 @@ namespace ILCompiler.Metadata
         {
             Cts.TypeDesc elementType = type.ElementType;
 
-            switch (elementType.UnderlyingType.Category)
+            if (elementType.IsEnum)
+            {
+                Cts.TypeSystemContext context = type.Context;
+                return new ConstantEnumArray
+                {
+                    ElementType = HandleType(elementType),
+                    Value = HandleCustomAttributeConstantArray(context.GetArrayType(elementType.UnderlyingType), value),
+                };
+            }
+
+            switch (elementType.Category)
             {
                 case Cts.TypeFlags.Boolean:
                     return new ConstantBooleanArray { Value = GetCustomAttributeConstantArrayElements<bool>(value) };