[ValueTracking] Recognize `X op (X != 0)` as non-zero

The ops supported are: `add`, `sub`, `xor`, `or`, `umax`, `uadd.sat`

Proofs: https://alive2.llvm.org/ce/z/8ZMSRg

The `add` case actually comes up in SPECInt, the rest are here mostly
for completeness.

Closes #88579