[InstCombine] clean up foldICmpWithConstant(); NFC
1. Early exit to reduce indent
2. Rename variables
3. Add local 'Pred' variable


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281615 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed