[AggressiveInstCombine] add tests for PR37098; NFC

I'm not sure if this is where we should try to fold these
patterns inspired by:
https://bugs.llvm.org/show_bug.cgi?id=37098
...if this isn't the right place, we can move the tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330642 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed