Supports XCVMEM extension instructions.

Placeholder Jiawei
2024-08-30T07:42:47Z

Supports XCVMEM extension instructions on QEMU 9.0 version, please update the dev branch first,

commit see https://github.com/pz9115/corev-qemu/commit/265859e12e8129617901bd8a74eb70d88adce984