RFR: 8347366: RISC-V: Add extension asserts for CMO instructions [v2]

[Robbin Ehn]

> Hi please consider this minor improvement.
> 
> Sanity tested.
> 
> Thanks, Robbin

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

  Review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23015/files
  - new: https://git.openjdk.org/jdk/pull/23015/files/ab936267..66d53aac

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23015&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23015&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23015.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23015/head:pull/23015

PR: https://git.openjdk.org/jdk/pull/23015