[llvm] [VectorCombine] Fold vector.reduce.OP(F(X)) == 0 -> OP(X) == 0 (PR #173069)

[Valeriy Savchenko via llvm-commits]

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SavchenkoValeriy wrote:

Ah, do you suggest to move my helper function to be a method of `llvm::Constant`?

https://github.com/llvm/llvm-project/pull/173069