RFR: 8202993: Add support for x86 testptr/testq with register and address

[Per Liden]

Thanks for reviewing, Vladimir!

/Per

On 05/11/2018 02:25 PM, Vladimir Kozlov wrote:
> Looks good.
> 
> Thanks,
> Vladimir
> 
> On 5/11/18 4:16 AM, Per Liden wrote:
>> On x86, we currently only have MacroAssembler::testptr() overloads for 
>> testing registers and immediate values. In ZGC, we need a version 
>> taking a register and an address.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8202993
>> Webrev: http://cr.openjdk.java.net/~pliden/8202993/webrev.0
>>
>> /Per