Fix missing write barrier in store field stub.

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 f8cf9704b1049d4efe812cc8f4036c016d3e366b..8325afe2f9a471906d22fbbd7325652a565b8528 100644
--- a/src/mips/stub-cache-mips.cc
+++ b/src/mips/stub-cache-mips.cc
@@ -458,10 +458,20 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
   }
 
   if (!transition.is_null()) {
-    // Update the map of the object; no write barrier updating is
-    // needed because the map is never in new space.
-    __ li(t0, Operand(transition));
-    __ sw(t0, FieldMemOperand(receiver_reg, HeapObject::kMapOffset));
+    // Update the map of the object.
+    __ li(scratch, Operand(transition));
+    __ sw(scratch, FieldMemOperand(receiver_reg, HeapObject::kMapOffset));
+
+    // Update the write barrier for the map field and pass the now unused
+    // name_reg as scratch register.
+    __ RecordWriteField(receiver_reg,
+                        HeapObject::kMapOffset,
+                        scratch,
+                        name_reg,
+                        kRAHasNotBeenSaved,
+                        kDontSaveFPRegs,
+                        OMIT_REMEMBERED_SET,
+                        OMIT_SMI_CHECK);
   }
 
   // Adjust for the number of properties stored in the object. Even in the