RFR: 8287729: Loom: Check alternative implementation on x86_32

[Aleksey Shipilev]

On Thu, 2 Jun 2022 14:35:26 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> [JDK-8287496](https://bugs.openjdk.java.net/browse/JDK-8287496) brought in alternative implementation for ports to use. This change tests that x86_32 works well with it, and removes the relevant exclusion lists. JVMTI parts are handled by [JDK-8287726](https://bugs.openjdk.java.net/browse/JDK-8287726).
> 
> Additional testing:
>  - [x] Linux x86_32 fastdebug, `tier1` (one failure, pre-existing)
>  - [x] Linux x86_32 fastdebug, `tier2` (clean)
>  - [x] Linux x86_32 fastdebug, `tier3` (a few interesting failures, look pre-existing, beyond the scope of this PR)

GHA runs seem clean as well, apart from `ToolEnablePreviewTest` failure that is handled by #8995. I would like to integrate this. Any more reviewers?

-------------

PR: https://git.openjdk.java.net/jdk/pull/8994