Use SmallVectorImpl& instead of SmallVector to avoid repeating small vector size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186274 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/Metadata.cpp b/lib/IR/Metadata.cpp
index 6a6b7af5..bd4d9c0 100644
--- a/lib/IR/Metadata.cpp
+++ b/lib/IR/Metadata.cpp
@@ -422,7 +422,7 @@
   return !A.intersectWith(B).isEmptySet() || isContiguous(A, B);
 }
 
-static bool tryMergeRange(SmallVector<Value*, 4> &EndPoints, ConstantInt *Low,
+static bool tryMergeRange(SmallVectorImpl<Value *> &EndPoints, ConstantInt *Low,
                           ConstantInt *High) {
   ConstantRange NewRange(Low->getValue(), High->getValue());
   unsigned Size = EndPoints.size();
@@ -439,7 +439,7 @@
   return false;
 }
 
-static void addRange(SmallVector<Value*, 4> &EndPoints, ConstantInt *Low,
+static void addRange(SmallVectorImpl<Value *> &EndPoints, ConstantInt *Low,
                      ConstantInt *High) {
   if (!EndPoints.empty())
     if (tryMergeRange(EndPoints, Low, High))