[llvm] [ LV] Fix for miscompile with disjoint or (PR #81922)

[via llvm-commits]

annamthomas wrote:

@fhahn Some lit tests are failing because we are very conservative with the disable vectorization check with disjoint or. But I wanted to see if this is the general path forward. This is a fix for [pr81872](https://github.com/llvm/llvm-project/issues/81872). 



https://github.com/llvm/llvm-project/pull/81922