[InstCombine] add tests to document bitcast + bitwise-logic behavior; NFC

The solution for PR26702 ( https://bugs.llvm.org/show_bug.cgi?id=26702 )
added a canonicalization rule, but the minimal regression tests don't 
demonstrate how that rule interacts with other folds.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303750 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed