Fix issue where attemping to get Type equality on McgFakeMetadataTypes causes an exception

- Fix it to behave as it did before NS2.0 and be a reference equality operation
- NS 2.0 work brought along a new Equals method that needs to be overriden for correct behavior

[tfs-changeset: 1672183]

1 files changed, 9 insertions, 0 deletions

diff --git a/src/System.Private.Interop/src/Shared/McgTypeHelpers.cs b/src/System.Private.Interop/src/Shared/McgTypeHelpers.cs
index 64e068128..115c84b6b 100644
--- a/src/System.Private.Interop/src/Shared/McgTypeHelpers.cs
+++ b/src/System.Private.Interop/src/Shared/McgTypeHelpers.cs
@@ -181,6 +181,15 @@ namespace System.Runtime.InteropServices
                 return false;
             }
 
+            public override bool Equals(Type o)
+            {
+                //
+                // We guarantee uniqueness in Mcg marshalling code
+                //
+
+                return Object.ReferenceEquals(this, o);
+            }
+
             public override int GetHashCode()
             {
                 return _fullTypeName.GetHashCode();