Use EXPEDITED by default
Summary: MEMBARRIER_CMD_SHARED is too slow, use EXPEDITED (or the mprotect hack if kernel is too old). hazptr has been using EXPEDITED for a while, the only other users are RCU and read_mostly_shared_ptr Reviewed By: yfeldblum, osandov Differential Revision: D7280190 fbshipit-source-id: 2a9aeab035f8996566b557d7f406686c361a37d7
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