RFR: 8315750: Update subtype check profile collection on PPC following 8308869 [v4]

[Lutz Schmidt]

On Mon, 18 Sep 2023 14:34:33 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Before this PR (measured on Power10):
>> 
>> Benchmark                                         (typePollution)   Mode  Cnt   Score   Error   Units
>> RequireNonNullCheckcastScalability.isDuplicated1            false  thrpt   20  82,510 ± 0,366  ops/us
>> RequireNonNullCheckcastScalability.isDuplicated1             true  thrpt   20  53,498 ± 0,112  ops/us
>> 
>> 
>> With this PR:
>> 
>> Benchmark                                         (typePollution)   Mode  Cnt   Score   Error   Units
>> RequireNonNullCheckcastScalability.isDuplicated1            false  thrpt   20  82,734 ± 0,129  ops/us
>> RequireNonNullCheckcastScalability.isDuplicated1             true  thrpt   20  82,738 ± 0,039  ops/us
>> 
>> 
>> See description in original PR: https://github.com/openjdk/jdk/pull/14375
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Further simplification: Remove klass_RInfo preservation code which is no longer needed.

Changes look good. 
Thank you for taking care of the PPC port!

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Marked as reviewed by lucy (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15685#pullrequestreview-1639941391