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

[Fei Yang]

On Thu, 9 Jan 2025 17:50:23 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

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

Nice cleanup! I only see two typos in code comment.

src/hotspot/cpu/riscv/assembler_riscv.hpp line 3094:

> 3092: 
> 3093:   // This instruction have some security implication.
> 3094:   // At this time it's not likley to be enable for user mode.

Suggestion: `// At this time it's not likely to be enabled for user mode.`

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23015#pullrequestreview-2541446072
PR Review Comment: https://git.openjdk.org/jdk/pull/23015#discussion_r1909715422