Use SmallVectorImpl::iterator/const_iterator instead of SmallVector to avoid specifying the vector size.

llvm-svn: 185606
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index f8f00cd..e470e14 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -925,7 +925,7 @@
   if (Dbgs.empty())
     return false;
 
-  for (SmallVector<DbgDeclareInst *, 4>::iterator I = Dbgs.begin(),
+  for (SmallVectorImpl<DbgDeclareInst *>::iterator I = Dbgs.begin(),
          E = Dbgs.end(); I != E; ++I) {
     DbgDeclareInst *DDI = *I;
     if (AllocaInst *AI = dyn_cast_or_null<AllocaInst>(DDI->getAddress())) {