[llvm] [AMDGPU][GlobalISel] Add RegBankLegalize support for ASSERT ops (PR #161296)

[Chinmay Deshpande via llvm-commits]

chinmaydd wrote:

An [assert-align](https://github.com/llvm/llvm-project/blob/main/llvm/test/CodeGen/AMDGPU/GlobalISel/assert-align.ll) LLVM IR test exists but requires support for `G_SI_CALL` if we need to switch it to the new RegBankSelect. 

This PR probably needs to be put on hold until that is completed.

https://github.com/llvm/llvm-project/pull/161296