Integrated: 8288040: x86: Loom: Improve cont/monitor-count helper methods

[Aleksey Shipilev]

On Wed, 8 Jun 2022 15:21:55 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> When doing x86_32 port, I realized that cont helper methods are sensitive to `rsp`, which makes the usual trick of using a scratch register for `thread` dangerous. We can just lift the entire thread-acquisition business into the methods themselves. Related to that, we can also do the same thing for monitor-count helper methods, thus fully isolating them from the caller code. It would be even better after [JDK-8286957](https://bugs.openjdk.org/browse/JDK-8286957).
> 
> This does the shared code change, so that x86_32 port can hopefully continue as late enhancement after RDP1.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug, `jdk_loom hotspot_loom`
>  - [x] Linux x86_32 fastdebug, `jdk_loom hotspot_loom`

This pull request has now been integrated.

Changeset: e5b56baf
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/e5b56bafa9ed68dec82adebc3eb298b70df7faeb
Stats:     165 lines in 8 files changed: 86 ins; 44 del; 35 mod

8288040: x86: Loom: Improve cont/monitor-count helper methods

Reviewed-by: coleenp, rpressler

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PR: https://git.openjdk.java.net/jdk/pull/9086