[llvm] [AMDGPU][AArch64][SelectionDAG] Added target hook check for SelectwithConstant (PR #127599)

[Vikash Gupta via llvm-commits]

vg0204 wrote:

@efriedma-quic , I am not quite sure about AArch64 tests, (as not much familiar with its target specific optimization). Even as @arsenm suggested the new override for target hook (should be taken care separately) mentioned for AArch64 apparently looked beneficial to me so did that based on changed LIT test after hook usgae. Can you comment even that override is needed for AArch64!

https://github.com/llvm/llvm-project/pull/127599