RFR: 8338727: RISC-V: Avoid synthetic data dependency in nmethod barrier on Ztso [v2]

[Robbin Ehn]

> Hi please consider,
> 
> On TSO we don't need the synthetic data dependency in between the loads.
> Also added some comment about this.
> 
> Sanity tested

Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:

  Comment update

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20661/files
  - new: https://git.openjdk.org/jdk/pull/20661/files/925b527f..0a7727a2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20661&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20661&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20661.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20661/head:pull/20661

PR: https://git.openjdk.org/jdk/pull/20661