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

[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 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>

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15031/files
  - new: https://git.openjdk.org/jdk/pull/15031/files/0c739b11..24f58e2c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15031&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15031&range=01-02

  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