RFR: 8313141: Remove discarded volatile qualifier in assembler_aarch64.hpp [v2]

[Julian Waters]

> 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 one additional commit since the last revision:

  Reference in assembler_aarch64.hpp

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15031/files
  - new: https://git.openjdk.org/jdk/pull/15031/files/a3737415..0c739b11

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15031&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15031&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15031.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15031/head:pull/15031

PR: https://git.openjdk.org/jdk/pull/15031