Merge r348181 into the 7.0 branch : [InstCombine] foldICmpWithLowBitMaskedVal(): disable 2 faulty folds.

|  |  |
| --- | --- |
| Bugzilla Link | [39873](https://llvm.org/bz39873) |
| Resolution | FIXED |
| Resolved on | Dec 06, 2018 21:58 |
| Version | 7.0 |
| OS | All |
| Blocks | llvm/llvm-project#38454  |
| CC | @RKSimon,@tstellar |
| Fixed by commit(s) | r348181 r348461 r348462 r348528 r348535 r348538 |

## Extended Description 
Is it OK to merge the following revision(s) to the 7.0 branch?