[llvm] [AMDGPU] add s_bitset[10]_b32 optimization for shl+[or, andn2] pattern (PR #134155)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Do you mean should I do it in td file?

Yes. This shouldn't require anything special that would require manual selection, or post-select folding (as you have here)

https://github.com/llvm/llvm-project/pull/134155