Use slot instead of value in the write barrier to record write from code.

src/mips/code-stubs-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7583 matching lines @@
 void RecordWriteStub::InformIncrementalMarker(MacroAssembler* masm, Mode mode) {
   regs_.SaveCallerSaveRegisters(masm, save_fp_regs_mode_);
   int argument_count = 3;
   __ PrepareCallCFunction(argument_count, regs_.scratch0());
   Register address =
       a0.is(regs_.address()) ? regs_.scratch0() : regs_.address();
   ASSERT(!address.is(regs_.object()));
   ASSERT(!address.is(a0));
   __ Move(address, regs_.address());
   __ Move(a0, regs_.object());
-  if (mode == INCREMENTAL_COMPACTION) {
-    __ Move(a1, address);
-  } else {
-    ASSERT(mode == INCREMENTAL);
-    __ lw(a1, MemOperand(address, 0));
-  }
+  __ Move(a1, address);
   __ li(a2, Operand(ExternalReference::isolate_address()));
 
   AllowExternalCallThatCantCauseGC scope(masm);
   if (mode == INCREMENTAL_COMPACTION) {
     __ CallCFunction(
         ExternalReference::incremental_evacuation_record_write_function(
             masm->isolate()),
         argument_count);
   } else {
     ASSERT(mode == INCREMENTAL);
@@ skipping 215 matching lines @@
   __ Pop(ra, t1, a1);
   __ Ret();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS