Fix ARM build

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/13529003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14123 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-arm.cc

@@ -2205,7 +2205,7 @@ LInstruction* LChunkBuilder::DoTransitionElementsKind(
     LOperand* new_map_reg = TempRegister();
     LTransitionElementsKind* result =
         new(zone()) LTransitionElementsKind(object, new_map_reg, NULL);
-    return DefineSameAsFirst(result);
+    return result;
   } else if (FLAG_compiled_transitions) {
     LTransitionElementsKind* result =
         new(zone()) LTransitionElementsKind(object, NULL, NULL);