[InstSimplify] add tests for (icmp X, C1 | icmp X, C2); NFC

These are the 'or' counterparts for the tests added with r300493.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302248 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed