[llvm] [TableGen] Use bitwise operations to access HwMode ID. (PR #88377)

[via llvm-commits]

superZWT123 wrote:

Hi @iii-i ,  I have discovered and resolved a potential issue where the existing 'getOperandBitOffset' interface was checking HwMode ID without first retrieving it. Could you please help me review the implementation of that part? Thank you very much!

https://github.com/llvm/llvm-project/pull/88377