RFR: Clean up ZLoadBarrierStubC1 tmp register allocation

[Per Liden]

Thanks Erik!

/Per

On 05/08/2018 12:51 PM, Erik Österlund wrote:
> Hi Per,
> 
> Looks good.
> 
> Thanks,
> /Erik
> 
> On 2018-05-08 11:31, Per Liden wrote:
>> This patch moves some of the register allocation logic in the C1 load 
>> barrier stub to shared code instead of being platform specific. 
>> There's also some cosmetic touch-ups of this code.
>>
>> http://cr.openjdk.java.net/~pliden/zgc/c1_load_barrier_stub_tmp_alloc/webrev.0 
>>
>>
>> /Per
>