Transitioning stores change maps.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/296953003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21417 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.h

@@ -6726,6 +6726,7 @@ class HStoreNamedField V8_FINAL : public HTemplateInstruction<3> {
     ASSERT(!has_transition());  // Only set once.
     SetOperandAt(2, transition);
     has_transition_ = true;
+    SetChangesFlag(kMaps);
   }
 
   bool NeedsWriteBarrier() {