[DebugInfo] Delete TypedDINodeRef

TypedDINodeRef<T> is a redundant wrapper of Metadata * that is actually a T *.

Accordingly, change DI{Node,Scope,Type}Ref uses to DI{Node,Scope,Type} * or their const variants.
This allows us to delete many resolve() calls that clutter the code.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D61369

llvm-svn: 360108

llvm/lib/Bitcode/Reader/MetadataLoader.cpp

@@ -337,7 +337,7 @@ Metadata *BitcodeReaderMetadataList::resolveTypeRefArray(Metadata *MaybeTuple) {
   if (!Tuple || Tuple->isDistinct())
     return MaybeTuple;
 
-  // Look through the DITypeRefArray, upgrading each DITypeRef.
+  // Look through the DITypeRefArray, upgrading each DIType *.
   SmallVector<Metadata *, 32> Ops;
   Ops.reserve(Tuple->getNumOperands());
   for (Metadata *MD : Tuple->operands())