[clang] [RISCV] Refactor checkRVVTypeSupport to use BuiltinVectorTypeInfo. (PR #74949)

[Yueh-Ting Chen via cfe-commits]

https://github.com/eopXD approved this pull request.

Looks good.

If I understand correctly, you mean that `vbool64_t` should emit diagnosis of requiring `zve64x` and should not emit error of `zve32x.`

https://github.com/llvm/llvm-project/pull/74949