RFR: 8278411: Implement UseHeavyMonitors consistently, s390 port

[Martin Doerr]

On Mon, 15 May 2023 11:43:34 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> This PR make s390x to adapt the changes done in [JDK-8276901](https://bugs.openjdk.org/browse/JDK-8276901) OR implements UseHeavyMonitors. 
>> 
>> [JDK-8291555](https://bugs.openjdk.org/browse/JDK-8291555) still needs Porting effort. As for `LM_LIGHTWEIGHT` locking mode, code is Unimplemented.
>
> src/hotspot/cpu/s390/macroAssembler_s390.cpp line 3194:
> 
>> 3192:     // Set NE to indicate 'failure' -> take slow-path
>> 3193:     z_ltgr(oop, oop);
>> 3194:   }
> 
> Dont you need a break to done here?

Ah, I found this, too.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13978#discussion_r1193795269