[InstCombine] Add test cases for D51398

These tests contain the pattern (neg (max ~X, C)) which we should transform to ((min X, ~C) + 1)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341023 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed