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/MallocChecker.cpp b/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
index c5286d1..1229a32 100644
--- a/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
@@ -1670,8 +1670,8 @@
   if (!Errors.empty()) {
     static SimpleProgramPointTag Tag("MallocChecker : DeadSymbolsLeak");
     N = C.addTransition(C.getState(), C.getPredecessor(), &Tag);
-    for (SmallVector<SymbolRef, 2>::iterator
-        I = Errors.begin(), E = Errors.end(); I != E; ++I) {
+    for (SmallVectorImpl<SymbolRef>::iterator
+           I = Errors.begin(), E = Errors.end(); I != E; ++I) {
       reportLeak(*I, N, C);
     }
   }