[llvm] Fix parentheses for clarity in X86ISelLowering.cpp (PR #121954)

[via llvm-commits]

soumyaGhoshh wrote:

> @soumyaGhoshh Were you successful in getting a working build? The patch LGTM so we can proceed with the merge, but if you're hoping to contribute again in the future you will need to get over these initial stages.

yh @RKSimon  i think you can definitely go for it i checked and the warning goes away and the build works fine. thanks for your suggestion 

https://github.com/llvm/llvm-project/pull/121954