[llvm] [AMDGPU] In instruction selector, allow copy from physical reg to s1 (PR #96157)

[Petar Avramovic via llvm-commits]

petar-avramovic wrote:

Can we get the whole patch that actually deals with i1 argument?
Need to check how uniformity analysis will calculate such copies.

https://github.com/llvm/llvm-project/pull/96157