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/StaticAnalyzer/Checkers/SimpleStreamChecker.cpp b/lib/StaticAnalyzer/Checkers/SimpleStreamChecker.cpp
index c2786e1..9ca0ab5 100644
--- a/lib/StaticAnalyzer/Checkers/SimpleStreamChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/SimpleStreamChecker.cpp
@@ -227,8 +227,8 @@
                                                ExplodedNode *ErrNode) const {
   // Attach bug reports to the leak node.
   // TODO: Identify the leaked file descriptor.
-  for (SmallVector<SymbolRef, 2>::iterator
-      I = LeakedStreams.begin(), E = LeakedStreams.end(); I != E; ++I) {
+  for (SmallVectorImpl<SymbolRef>::iterator
+         I = LeakedStreams.begin(), E = LeakedStreams.end(); I != E; ++I) {
     BugReport *R = new BugReport(*LeakBugType,
         "Opened file is never closed; potential resource leak", ErrNode);
     R->markInteresting(*I);