RFR (11): Revert to emit locked cmpxchg only on MP

[Aleksey Shipilev]

On 5/29/19 3:23 PM, Roman Kennke wrote:
>>> Last backports introduced a minor diff vs. upstream that we can and
>>> should revert:
>>>
>>> http://cr.openjdk.java.net/~rkennke/jdk11-revert-lock-cas/webrev.00/
>>
>> Looks good.
>>
>> I think there is a white-space difference here:
>>  1942    } else {
>>
>> See:
>>
>> https://builds.shipilev.net/patch-openjdk-shenandoah-jdk11/src/hotspot/cpu/x86/c1_LIRAssembler_x86.cpp.sdiff.html
>>
>> Can you "hg diff -r 435ba0b576c9 src/hotspot/cpu/x86/c1_LIRAssembler_x86.cpp" to see it?
> 
> I'll revert that WS diff too, ok?

Yes, do that before push. Check the "hg diff" above before you push.

-Aleksey