RFR: 8329083: RISC-V: Update profiles supported on riscv [v2]

[Hamlin Li]

> Hi,
> Can you help to review this patch to update vm flags related to riscv profile?
> Thanks
> 
> Currently there are vm options like -XX:+UseRVA20U64 and -XX:+UseRVA22U64 on riscv to indicate the supported riscv extension via profiles.
> These profiles should be updated to reflect the full supported extensions and new profile like UseRVA23U64 should be added too.

Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:

  remove optional extensions

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18599/files
  - new: https://git.openjdk.org/jdk/pull/18599/files/d55e7644..bd2481ed

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18599&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18599&range=00-01

  Stats: 8 lines in 2 files changed: 2 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18599.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18599/head:pull/18599

PR: https://git.openjdk.org/jdk/pull/18599