[llvm] [NFC][LV]: Differentiate between Pred and Unpred masked operations. (PR #169509)

[Hassnaa Hamdi via llvm-commits]

hassnaaHamdi wrote:

@fhahn 
If we need to support predicated vector epilogue loop in combination with unpredicted vector main loop, so we need to differentiate if the instruction needs masking because it's in conditionally-executed block or because there will be predicated epilogue loop.
So in the unpredicted vector main loop, we will use the masked instruction only if it's marked as conditionally-executed instruction, otherwise we will not use it.

https://github.com/llvm/llvm-project/pull/169509