RFR: 8369616: JavaFrameAnchor on RISC-V has unnecessary barriers and wrong store order in MacroAssembler [v2]

[Feilong Jiang]

> Same as [JDK-8369190](https://bugs.openjdk.org/browse/JDK-8369190), but for the RISC-V port.
> 
> Testing:
> - [x] tier1-3

Feilong Jiang has updated the pull request incrementally with one additional commit since the last revision:

  update comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27757/files
  - new: https://git.openjdk.org/jdk/pull/27757/files/004d2e04..2aba63c7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27757&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27757&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27757.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27757/head:pull/27757

PR: https://git.openjdk.org/jdk/pull/27757