[RISCV] Add InstAlias for Zbb Zbp and Zbs extension

Add InstAlias that allows the last operand to be an imm for following instructions:

1. Zbb or Zbp:
    - ror
    - rorw (RV64 Only)

2. Zbs
    - best
    - bclr
    - binv
    - bext

Reviewed By: craig.topper, jrtc27

Differential Revision: https://reviews.llvm.org/D100083