Quentin Colombet 491d1356a7 Revert r262759 and r262760.
The fix consisting in using the library call for atomic compare and swap when
the instruction is not safe to use may be incorrect. Indeed the library call may
not exist on all platform. In other words, we need a better fix! 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262943 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-08 17:29:11 +00:00
..
2016-03-08 17:29:11 +00:00
2016-03-08 07:42:12 +00:00