RFR: 8369190: JavaFrameAnchor on AArch64 has unnecessary barriers and wrong store order in MacroAssembler [v4]

[Justin King]

> Remove unnecessary release barriers in `JavaFrameAnchor::{copy,clear}` and fix `MacroAssembler::set_last_Java_frame` to set `sp` last as expected by the profiler.

Justin King has updated the pull request incrementally with one additional commit since the last revision:

  Add comment to JavaFrameAnchor regarding no need for fencing
  
  Signed-off-by: Justin King <jcking at google.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27645/files
  - new: https://git.openjdk.org/jdk/pull/27645/files/253417f9..016769df

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27645&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27645&range=02-03

  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27645.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27645/head:pull/27645

PR: https://git.openjdk.org/jdk/pull/27645