[llvm] [NFC][TTI] Introduce getInstructionUniformity API for uniformity analysis (PR #168903)

[Pankaj Dwivedi via llvm-commits]

PankajDwivedi-25 wrote:

I have removed those functions and have made as them private members for the targets that require them.

https://github.com/llvm/llvm-project/pull/168903