[llvm] [X86] X86LegalizerInfo - use LegalFor instead if LegalIf for simple ISA/test pairs (PR #144675)

[Dipesh Sharma via llvm-commits]

dipeshs809 wrote:

@RKSimon do I need to add any release notes for it ? If yes, can you specify the target `rst` file?

Also, as per my understanding, since `legalFor` is a substitute for `legalIf` and its not changing the behaviour of the program, additional test cases are not needed.

https://github.com/llvm/llvm-project/pull/144675