[InstCombine] add more tests for fcmp+select -> fabs; NFC

This should correspond to the patterns in D44091 and might
make handling these in the DAG unnecessary.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327689 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed