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H A Dhv_connection.cdiff 300105 Wed May 18 03:31:16 MDT 2016 sephe hyperv/vmbus: Use atomic swap and flsl to process event flags

Greatly reduce the locked instructions and reduce number of inner loops.

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6404

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