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

llvm-svn: 185606
diff --git a/llvm/lib/Transforms/Utils/CodeExtractor.cpp b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
index f7c659f..82013f9 100644
--- a/llvm/lib/Transforms/Utils/CodeExtractor.cpp
+++ b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
@@ -277,8 +277,8 @@
 
         DomTreeNode *NewNode = DT->addNewBlock(New, *I);
 
-        for (SmallVector<DomTreeNode*, 8>::iterator I = Children.begin(),
-               E = Children.end(); I != E; ++I) 
+        for (SmallVectorImpl<DomTreeNode *>::iterator I = Children.begin(),
+               E = Children.end(); I != E; ++I)
           DT->changeImmediateDominator(*I, NewNode);
       }
     }