Use SmallVectorImpl instead of SmallVector for iterators and references to avoid specifying the vector size unnecessarily.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185610 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 162b5b8..3896556 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -5810,7 +5810,7 @@
   if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
     NewFDisConst = NewMD->isConst();
 
-  for (SmallVector<std::pair<FunctionDecl *, unsigned>, 1>::iterator
+  for (SmallVectorImpl<std::pair<FunctionDecl *, unsigned>>::iterator
        NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end();
        NearMatch != NearMatchEnd; ++NearMatch) {
     FunctionDecl *FD = NearMatch->first;