[InstSimplify] add/move tests for (icmp X, C1 & icmp X, C2); NFC

We simplify based on range intersection, but we're missing folds.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300493 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed