[llvm] [AMDGPU][SDAG] Support source modifiers on select integer operands (PR #147325)

[Chris Jackson via llvm-commits]

chrisjbris wrote:

I've moved a simplified combine to the TI DAGCombiner::visitSelect(). For AMDGPU this appears to have improved codegen across a number of tests, but probably worth inspecting by more experience AMDGPU programmers. Thanks. but let's see what CI thinks, as locally I only test against X86 and AMDGPU.

https://github.com/llvm/llvm-project/pull/147325