[llvm] [InstCombine] Fold `(icmp eq/ne (or (select cond, 0/NZ, 0/NZ), X), 0)` (PR #88183)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

@goldsteinn Can you have a look at the ir diff? https://github.com/dtcxzyw/llvm-opt-benchmark/pull/491
There are some unnecessary and/or insts before branches.


https://github.com/llvm/llvm-project/pull/88183