Allow bitfield types to be elidable.

Test: mma

Bug: 33298401
Change-Id: I3066d8f0773c135b181cea497f971d9624a77bd6
diff --git a/EnumType.h b/EnumType.h
index 04d8b61..96aec42 100644
--- a/EnumType.h
+++ b/EnumType.h
@@ -140,6 +140,8 @@
 
     bool isCompatibleElementType(Type *elementType) const override;
 
+    bool isElidableType() const override;
+
     const ScalarType *resolveToScalarType() const override;
 
     std::string getCppType(StorageMode mode,