Use SmallVectorImpl& for function arguments instead of SmallVector.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185715 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index 8398969..419075f 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -2332,7 +2332,7 @@
 
 static
 llvm::Constant *GenerateConstantVector(CGBuilderTy &Builder,
-                                       SmallVector<unsigned, 4> &Elts) {
+                                       SmallVectorImpl<unsigned> &Elts) {
   SmallVector<llvm::Constant*, 4> CElts;
   for (unsigned i = 0, e = Elts.size(); i != e; ++i)
     CElts.push_back(Builder.getInt32(Elts[i]));