[llvm] [InstCombine] Fold `select Cond, not X, X` into `Cond ^ X` (PR #90089)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> TEST 'BOLT :: RISCV/unnamed-sym-no-entry.c' FAILED

The test failure is unrelated with this patch.

https://github.com/llvm/llvm-project/pull/90089