RFR: 8313141: Remove discarded volatile qualifier in assembler_aarch64.hpp [v3]

[Julian Waters]

On Fri, 28 Jul 2023 03:33:22 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> ISO C++ asm is always implicitly volatile, as per https://gcc.gnu.org/onlinedocs/gcc/Basic-Asm.html, and all volatile qualifiers are always ignored if GNU asm was never used
>
> Julian Waters has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - assembler_aarch64.hpp
>  - src/hotspot/cpu/aarch64/assembler_aarch64.hpp
>    
>    Co-authored-by: Andrew Haley <aph-open at littlepinkcloud.com>

Changed as requested, but I added the part about GNU extensions since I feel that it is important information

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PR Comment: https://git.openjdk.org/jdk/pull/15031#issuecomment-1655210412