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8256406: G1 x86 C1/Interpreter post write barrier always uses 32 bit to access variable sized PtrQueue::_index #1257

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@@ -319,7 +319,7 @@ void G1BarrierSetAssembler::g1_write_barrier_post(MacroAssembler* masm,

__ movptr(tmp2, queue_index);
__ testptr(tmp2, tmp2);
__ jcc(Assembler::equal, runtime);
__ jcc(Assembler::zero, runtime);
__ subptr(tmp2, wordSize);
__ movptr(queue_index, tmp2);
__ addptr(tmp2, buffer);