RFR: 8287818: Shenandoah: adapt nmethod arming from Loom [v2]

[Aleksey Shipilev]

On Thu, 23 Jun 2022 19:02:53 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Loom implemented nmethod arming mechanism, which is very similar to Shenandoah's. Shenandoah can use it.
>> 
>> Test:
>> 
>> - [x] hotspot_gc_shenandoah on Linux x86_64 and Windows x64
>> - [x] tier1 with Shenandoah GC on Linux x86_64 and Windows x64 
>> - [x] hotspot_gc_shenandoah on AArch64
>
> Zhengyu Gu has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
> 
>  - Add a newline
>  - Merge branch 'master' into 8287818-nmethod-arming
>  - 8287818: Shenandoah: adapt nmethod arming from Loom
>  - Merge branch 'master' into migrate_nmethod_arming_shenandoah
>  - v0

Marked as reviewed by shade (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/9048