[llvm] [CodeGen][TII] Simplify analyzeSelect (PR #175828)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

At this point, do we need analyzeSelect() at all? Can't the "can this be optimized?" check also be handled by optimizeSelect() directly?

https://github.com/llvm/llvm-project/pull/175828