IR: MDNode => Value: Instruction::getAllMetadata()

Change `Instruction::getAllMetadata()` to modify a vector of `Value`
instead of `MDNode` and update call sites.  This is part of PR21433.

llvm-svn: 221027
diff --git a/llvm/lib/Transforms/Utils/ValueMapper.cpp b/llvm/lib/Transforms/Utils/ValueMapper.cpp
index 0f20e6d..3175542 100644
--- a/llvm/lib/Transforms/Utils/ValueMapper.cpp
+++ b/llvm/lib/Transforms/Utils/ValueMapper.cpp
@@ -208,12 +208,11 @@
   }
 
   // Remap attached metadata.
-  SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
+  SmallVector<std::pair<unsigned, Value *>, 4> MDs;
   I->getAllMetadata(MDs);
-  for (SmallVectorImpl<std::pair<unsigned, MDNode *> >::iterator
-       MI = MDs.begin(), ME = MDs.end(); MI != ME; ++MI) {
-    MDNode *Old = MI->second;
-    MDNode *New = MapValue(Old, VMap, Flags, TypeMapper, Materializer);
+  for (auto MI = MDs.begin(), ME = MDs.end(); MI != ME; ++MI) {
+    Value *Old = MI->second;
+    Value *New = MapValue(Old, VMap, Flags, TypeMapper, Materializer);
     if (New != Old)
       I->setMetadata(MI->first, New);
   }