Rename loop unrolling and loop vectorizer metadata to have a common prefix.

[LLVM part]

These patches rename the loop unrolling and loop vectorizer metadata
such that they have a common 'llvm.loop.' prefix.  Metadata name
changes:

llvm.vectorizer.* => llvm.loop.vectorizer.*
llvm.loopunroll.* => llvm.loop.unroll.*

This was a suggestion from an earlier review
(http://reviews.llvm.org/D4090) which added the loop unrolling
metadata. 

Patch by Mark Heffernan.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211710 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -906,7 +906,7 @@ public:
   }
 
   /// Return the loop vectorizer metadata prefix.
-  static StringRef Prefix() { return "llvm.vectorizer."; }
+  static StringRef Prefix() { return "llvm.loop.vectorize."; }
 
   MDNode *createHint(LLVMContext &Context, StringRef Name, unsigned V) const {
     SmallVector<Value*, 2> Vals;
@@ -5859,4 +5859,3 @@ Value *InnerLoopUnroller::getConsecutiveVector(Value* Val, int StartIdx,
   Constant *C = ConstantInt::get(ITy, StartIdx, Negate);
   return Builder.CreateAdd(Val, C, "induction");
 }
-