[InstCombine] Provide more test cases for cast-folding [NFC]
Summary: In r275989 we enabled the folding of `logic(cast(icmp), cast(icmp))` to `cast(logic(icmp, icmp))`. Here we add more test cases to assure this folding works for all logical operations `and`/`or`/`xor`.
Reviewers: grosser
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D22561
Contributed-by: Matthias Reisinger
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276105
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