[llvm] [VectorCombine] Use InstSimplifyFolder to simplify instrs on creation. (PR #146350)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

InstSimplifyFolder is incompatible with setting instruction flags after the fact, so this code should be adjusted: https://github.com/llvm/llvm-project/blob/2c60d7dfcfe7b52db7b563db8306a8ee569975b4/llvm/lib/Transforms/Vectorize/VectorCombine.cpp#L1465-L1468

https://github.com/llvm/llvm-project/pull/146350