RFR: 8312585: Rename DisableTHPStackMitigation flag to THPStackMitigation [v2]

[Aleksey Shipilev]

On Mon, 7 Aug 2023 07:19:08 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> The flag newly added by [JDK-8312182](https://bugs.openjdk.org/browse/JDK-8312182) is prompting the use of `-XX:+DisableTHPStackMitigation` to disable the THP stack mitigation, thus allowing THP in thread stacks. This double negation does not read well, and not in line with other mitigation flags like `IntelJccErratumMitigation`.
>> 
>> It would be better to rename the flag to avoid double-negation, before it proliferates to other JDK releases.
>> 
>> (I would have the same comment during the original review, but missed it :P)
>> 
>> Additional testing: 
>>  - [x] GHA
>>  - [x] Linux x86_64 fastdebug, affected test
>
> Aleksey Shipilev 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 two additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8312585-rename-thp-mitigation
>  - Fix

RISC-V GHA failure is the infrastructural one, to be fixed with another PR.
I think we are good with integrating this one.

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PR Comment: https://git.openjdk.org/jdk/pull/14992#issuecomment-1667624160