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

[Chris Jackson via llvm-commits]

chrisjbris wrote:

Thanks to all reviewers but I think I need to deprecate this PR in favour of the simpler https://github.com/llvm/llvm-project/pull/149110.

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