[lilliput-jdk17u:lilliput] RFR: 8308107: [Lilliput/JDK17] Cherry-pick: 8291555: Implement alternative fast-locking scheme [v3]

[Aleksey Shipilev]

On Mon, 22 May 2023 17:40:56 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp line 724:
>> 
>>> 722:       // Call the slow-path instead.
>>> 723:       jcc(Assembler::notEqual, DONE_LABEL);
>>> 724:     }
>> 
>> (Cannot comment on unaffected code, commenting on the nearest hunk)
>> 
>> Upstream does `jmpb` -> `jmp`  in the RTM block below: https://github.com/openjdk/jdk/commit/7f6358a8b53a35a87c9413c68f8fe6c5fdec0caf#diff-318d0e76b9a97e8cf8936be1de34e52735c4d947a77cac38babbbf9a081d16fcR812
>
> Yes, but it already is jmp here? So no need to change anything?

Right, nevermind.

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PR Review Comment: https://git.openjdk.org/lilliput-jdk17u/pull/19#discussion_r1200839400