IR: Move creation logic to MDNodeFwdDecl, NFC

Same as with `MDTuple`, factor out a `friend MDNode` by moving creation
logic to the concrete subclass.

llvm-svn: 225690

2 files changed, 6 insertions, 7 deletions

diff --git a/llvm/include/llvm/IR/Metadata.h b/llvm/include/llvm/IR/Metadata.h
index d06621df3aa..1f327f6bdb3 100644
--- a/llvm/include/llvm/IR/Metadata.h
+++ b/llvm/include/llvm/IR/Metadata.h
@@ -813,7 +813,6 @@ MDNode *MDNode::getDistinct(LLVMContext &Context, ArrayRef<Metadata *> MDs) {
 /// uniqued, and is suitable for forward references.
 class MDNodeFwdDecl : public MDNode, ReplaceableMetadataImpl {
   friend class Metadata;
-  friend class MDNode;
   friend class ReplaceableMetadataImpl;
 
   MDNodeFwdDecl(LLVMContext &C, ArrayRef<Metadata *> Vals)
@@ -823,6 +822,10 @@ public:
   ~MDNodeFwdDecl() { dropAllReferences(); }
   using MDNode::operator delete;
 
+  static MDNodeFwdDecl *get(LLVMContext &Context, ArrayRef<Metadata *> MDs) {
+    return new (MDs.size()) MDNodeFwdDecl(Context, MDs);
+  }
+
   static bool classof(const Metadata *MD) {
     return MD->getMetadataID() == MDNodeFwdDeclKind;
   }
diff --git a/llvm/lib/IR/Metadata.cpp b/llvm/lib/IR/Metadata.cpp
index 3d444660c67..9088a75156e 100644
--- a/llvm/lib/IR/Metadata.cpp
+++ b/llvm/lib/IR/Metadata.cpp
@@ -607,14 +607,10 @@ MDTuple *MDTuple::getDistinct(LLVMContext &Context, ArrayRef<Metadata *> MDs) {
 
 MDNodeFwdDecl *MDNode::getTemporary(LLVMContext &Context,
                                     ArrayRef<Metadata *> MDs) {
-  MDNodeFwdDecl *N = new (MDs.size()) MDNodeFwdDecl(Context, MDs);
-  return N;
+  return MDNodeFwdDecl::get(Context, MDs);
 }
 
-void MDNode::deleteTemporary(MDNode *N) {
-  assert(isa<MDNodeFwdDecl>(N) && "Expected forward declaration");
-  delete cast<MDNodeFwdDecl>(N);
-}
+void MDNode::deleteTemporary(MDNode *N) { delete cast<MDNodeFwdDecl>(N); }
 
 void UniquableMDNode::storeDistinctInContext() {
   assert(!IsDistinctInContext && "Expected newly distinct metadata");