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

[Feilong Jiang]

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

Testing:
- [x] tier1-3

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Commit messages:
 - JavaFrameAnchor on RISCV has unnecessary barriers and wrong store order in MacroAssembler

Changes: https://git.openjdk.org/jdk/pull/27757/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27757&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369616
  Stats: 19 lines in 2 files changed: 9 ins; 9 del; 1 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