smallvectorize the list of returns built by CloneAndPruneFunctionInto.

llvm-svn: 80202
diff --git a/llvm/lib/Transforms/Utils/CloneModule.cpp b/llvm/lib/Transforms/Utils/CloneModule.cpp
index 13b2d46..0285f8c 100644
--- a/llvm/lib/Transforms/Utils/CloneModule.cpp
+++ b/llvm/lib/Transforms/Utils/CloneModule.cpp
@@ -108,7 +108,7 @@
         ValueMap[J] = DestI++;
       }
 
-      std::vector<ReturnInst*> Returns;  // Ignore returns cloned...
+      SmallVector<ReturnInst*, 8> Returns;  // Ignore returns cloned.
       CloneFunctionInto(F, I, ValueMap, Returns);
     }