RFR: 8291555: Implement alternative fast-locking scheme [v51]

[Roman Kennke]

On Mon, 3 Apr 2023 08:37:51 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Looks like there is a typo here. I think this should be:
> 
> ```
> assert(LockingMode != 2, "should not be called with new lightweight locking");
> ```

Thanks for catching this! I pushed a fix.
You might want to try the riscv port again, I have made some changes that might have broken it. Also, you might want to compare it again with aarch64 (or x86_64), I have done a bunch of changes and improvements that you might want to adopt.

Thanks!
Roman

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PR Review Comment: https://git.openjdk.org/jdk/pull/10907#discussion_r1155894717