[llvm] [TTI] Introduce getInstructionUniformity API for flexible uniformity analysis (PR #137639)

[Pankaj Dwivedi via llvm-commits]

PankajDwivedi-25 wrote:

sorry but i am bit confused here `llvm.amdgcn.permlane16 <old> <src0> <src1> <src2> <fi> <bound_control>' in the current patch i am checking op-0, and op-1 uniformity. 

but from this discussion it looks like it should be op-(which is source) and op-2(which is lane select)?
@jayfoad @ruiling 

https://github.com/llvm/llvm-project/pull/137639