RFR: 8316743: RISC-V: Change UseVectorizedMismatchIntrinsic option result to warning

[Logan Abernathy]

On Fri, 22 Sep 2023 14:17:40 GMT, Ilya Gavrilin <igavrilin at openjdk.org> wrote:

> Please review this small change for UseVectorizedMismatchIntrinsic option.
> On RISC-V we do not have VectorizedMismatch intrinsic, so `void LIRGenerator::do_vectorizedMismatch(Intrinsic* x)` prodeuces fatal error when this option turned on.
> Other similar options (like -XX:+UseCRC32Intrinsics) produces only warning: https://github.com/openjdk/jdk/blob/c90d63105ca774c047d5f5a4348aa657efc57953/src/hotspot/cpu/riscv/vm_version_riscv.cpp#L150-L183
> Also, on platforms, where VectorizedMismatch unimplemented to we got warning.

Marked as reviewed by M4ximumPizza at github.com (no known OpenJDK username).

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PR Review: https://git.openjdk.org/jdk/pull/15890#pullrequestreview-1643202886