[VPlan] Remove VPTransformState::addMetadata with ArrayRef arg (NFCI).

addMeadata is only over called with a single element, clean up the
variant that takes multiple values.

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlan.cpp

@@ -358,23 +358,14 @@ void VPTransformState::addNewMetadata(Instruction *To,
     LVer->annotateInstWithNoAlias(To, Orig);
 }
 
-void VPTransformState::addMetadata(Instruction *To, Instruction *From) {
+void VPTransformState::addMetadata(Value *To, Instruction *From) {
   // No source instruction to transfer metadata from?
   if (!From)
     return;
 
-  propagateMetadata(To, From);
-  addNewMetadata(To, From);
-}
-
-void VPTransformState::addMetadata(ArrayRef<Value *> To, Instruction *From) {
-  // No source instruction to transfer metadata from?
-  if (!From)
-    return;
-
-  for (Value *V : To) {
-    if (Instruction *I = dyn_cast<Instruction>(V))
-      addMetadata(I, From);
+  if (Instruction *ToI = dyn_cast<Instruction>(To)) {
+    propagateMetadata(ToI, From);
+    addNewMetadata(ToI, From);
   }
 }
 

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -346,11 +346,7 @@ struct VPTransformState {
   /// This includes both the original MDs from \p From and additional ones (\see
   /// addNewMetadata).  Use this for *newly created* instructions in the vector
   /// loop.
-  void addMetadata(Instruction *To, Instruction *From);
-
-  /// Similar to the previous function but it adds the metadata to a
-  /// vector of instructions.
-  void addMetadata(ArrayRef<Value *> To, Instruction *From);
+  void addMetadata(Value *To, Instruction *From);
 
   /// Set the debug location in the builder using the debug location \p DL.
   void setDebugLocFrom(DebugLoc DL);