Revert commit b6cf400aa fro llvm git (by Nemanja Ivanovic):
Fix bots after a9ad65a2b34f In the last commit, I neglected to initialize the new subtarget feature I added which caused failures on a few bots. This should fix that.
This unbreaks the build after r359981, which reverted upstream commit
a9ad65a2b34f.
Reported by: jhibbits (and jenkins :)
MFC after: 6 weeks
X-MFC-With: 358851