RFR: 8305056: Avoid unaligned access in emit_intX methods if it's unsupported [v6]

[Vladimir Kempik]

On Thu, 20 Apr 2023 13:58:26 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

>> Please review this change which attempts to eliminate unaligned memory stores generated by emit_int16/32/64 methods on some platforms.
>> 
>> Primary aim is risc-v platform. But I had to change some code in ppc/arm32/x86 to prevent possible perf degradation.
>
> Vladimir Kempik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rewrite few more helpers

Windows failures are infra issue ( visual studio can't be installed) and unrelated.

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PR Comment: https://git.openjdk.org/jdk/pull/13227#issuecomment-1516615266