[Bug target/109479] [RISC-V] Build vint64m1_t with rv64gc_zve32x_zvl64b should promote information like "vint64m1_t requires the 'zve64x' extensions"

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109479

--- Comment #6 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
https://gcc.gnu.org/pipermail/gcc-patches/2023-April/615562.html
Fix patch here.