RFR: 8351162: Clean up x86 (Macro)Assembler after 32-bit x86 removal [v2]

[Aleksey Shipilev]

On Tue, 15 Apr 2025 18:30:26 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> This improvement targets x86 `(Macro)Assembler`. We are mostly cleaning up `LP64` predicated code blocks, and a bit of related code.
>> 
>> It is enticing to remove all `*ptr` methods, and rename all uses from `*ptr` to `*q`, but that turns out to be very intrusive. That is left for a future RFE, if we ever consider doing it.
>> 
>> Additional testing:
>>  - [x] Linux x86_64 server fastdebug, `all`
>
> 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 three additional commits since the last revision:
> 
>  - Hollow out x86.inline.hpp
>  - Merge branch 'master' into JDK-8351162-assemblers-clean
>  - Fix

Thanks! Here goes.

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PR Comment: https://git.openjdk.org/jdk/pull/24631#issuecomment-2808448722