Merged r11286 into 3.9 branch.

src/mips/stub-cache-mips.cc

Index: src/mips/stub-cache-mips.cc
diff --git a/src/mips/stub-cache-mips.cc b/src/mips/stub-cache-mips.cc
index 294bc0a0747cab372f832cafa4acdd523c5a69d4..f7b94b926144931393232bc96743a2637e169383 100644
--- a/src/mips/stub-cache-mips.cc
+++ b/src/mips/stub-cache-mips.cc
@@ -429,8 +429,10 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
   // a0 : value.
   Label exit;
   // Check that the map of the object hasn't changed.
+  CompareMapMode mode = transition.is_null() ? ALLOW_ELEMENT_TRANSITION_MAPS
+                                             : REQUIRE_EXACT_MAP;
   __ CheckMap(receiver_reg, scratch, Handle<Map>(object->map()), miss_label,
-              DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
+              DO_SMI_CHECK, mode);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {