RFR: Aarch64 cmpxchg_oop() fix

[Roman Kennke]

>> Aleksey spotted a bug that we apparently introduced with LRB. Let's
>> revert this little part:
>>
>> diff -r c5a159a6b36d
>> src/hotspot/cpu/aarch64/gc/shenandoah/shenandoahBarrierSetAssembler_aarch64.cpp
>> ---
>> a/src/hotspot/cpu/aarch64/gc/shenandoah/shenandoahBarrierSetAssembler_aarch64.cpp
>> Mon Apr 01 13:33:58 2019 +0200
>> +++
>> b/src/hotspot/cpu/aarch64/gc/shenandoah/shenandoahBarrierSetAssembler_aarch64.cpp
>> Tue Apr 02 23:09:55 2019 +0200
>> @@ -414,7 +414,9 @@
>>     }
>>     __ bind(done);
>>
>> -  if (!is_cae) {
>> +  if (is_cae) {
>> +    __ mov(result, tmp1);
>> +  } else {
>>       __ cset(result, Assembler::EQ);
>>     }
>>   }
>>
>> Testing: hotspot_gc_shenandoah on aarch64
> 
> OK, looks good. Was any test failing because of this?

Nothing in hotspot_gc_shenandoah.

Roman