Merge the remaining RVA23 extensions and several other important extensions

Mainly includes the following RISC-V extensions modifications.

1. Support __bf16 and Zfbfmin/Zvfbfwma extensions.
2. Support Zvfbfmin and Zvfbfwma intrinsic.
3. Support Zimop extension.
4. Introduce -mvector-strict-align.
5. Add Zicboz extension support
6. Implement CMO extensions: Zaamo, Zalrsc, Zabha, Zacas
7. Add intrinsic support for CMOs via riscv_cmo.h header
8. Enable zvbb extension with intrinsic implementations
9. Introduce Zicfiss/Zicfilp security extensions
10. Fix some ICEs and RVV codegen issues (vsetvl, overlaps, missing intrinsics, etc.)
11. Add compiler support for xt-c930 (-mcpu/-mtune)