RFR: 8354231: x86: Purge FPU support from (Macro)Assembler after 32-bit x86 removal [v2]

[Coleen Phillimore]

On Fri, 11 Apr 2025 08:04:52 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> There are lots of cleanups possible in (Macro)Assembler after 32-bit x86 removal. This cleanup is focused on removing the large parts of x87 FPU support that are no longer needed. Note that _some_ math stubs are actually using x87 FPU in a very limited manner, but the implementations use separate definitions (under `LP64`). Those are left alone, and we clean up x86_32 code here.
>> 
>> 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 pull request now contains two commits:
> 
>  - Merge branch 'master' into JDK-8354231-x86-assemblers-fpu
>  - Fix

Marked as reviewed by coleenp (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24558#pullrequestreview-2761371571