[InstSimplify] Add tests for signed icmp of and/or; NFC

Even if a signed predicate is used, the ranges computed for and/or
are unsigned, resulting in missed simplifications.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356720 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed