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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185540 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/lib/Transforms/Scalar/MemCpyOptimizer.cpp
index c325925..8f61ffd 100644
--- a/lib/Transforms/Scalar/MemCpyOptimizer.cpp
+++ b/lib/Transforms/Scalar/MemCpyOptimizer.cpp
@@ -465,7 +465,7 @@
       AMemSet->setDebugLoc(Range.TheStores[0]->getDebugLoc());
 
     // Zap all the stores.
-    for (SmallVector<Instruction*, 16>::const_iterator
+    for (SmallVectorImpl<Instruction *>::const_iterator
          SI = Range.TheStores.begin(),
          SE = Range.TheStores.end(); SI != SE; ++SI) {
       MD->removeInstruction(*SI);