[InstCombine] more clean up of foldICmpXorConstant(); NFCI

Use m_APInt for the xor constant, but this is all still guarded by the initial
ConstantInt check, so no vector types should make it in here.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278957 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed