Reland "Allocation site support for monomorphic StringAdds in BinaryOps".

src/ia32/lithium-codegen-ia32.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 4894 matching lines @@
   __ StoreToSafepointRegisterSlot(result, eax);
 }
 
 
 void LCodeGen::DoStringAdd(LStringAdd* instr) {
   ASSERT(ToRegister(instr->context()).is(esi));
   if (FLAG_new_string_add) {
     ASSERT(ToRegister(instr->left()).is(edx));
     ASSERT(ToRegister(instr->right()).is(eax));
     NewStringAddStub stub(instr->hydrogen()->flags(),
-                          isolate()->heap()->GetPretenureMode());
+                          instr->hydrogen()->pretenure_flag());
     CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
   } else {
     EmitPushTaggedOperand(instr->left());
     EmitPushTaggedOperand(instr->right());
     StringAddStub stub(instr->hydrogen()->flags());
     CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
   }
 }
 
 
@@ skipping 1437 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32