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/AST/ASTDumper.cpp b/lib/AST/ASTDumper.cpp
index dddc4d4..c66676f 100644
--- a/lib/AST/ASTDumper.cpp
+++ b/lib/AST/ASTDumper.cpp
@@ -335,8 +335,8 @@
     OS << "\n";
 
   ColorScope Color(*this, IndentColor);
-  for (llvm::SmallVector<IndentType, 32>::const_iterator I = Indents.begin(),
-                                                         E = Indents.end();
+  for (SmallVectorImpl<IndentType>::const_iterator I = Indents.begin(),
+                                                   E = Indents.end();
        I != E; ++I) {
     switch (*I) {
     case IT_Child: