kib 5926081022 Use plain store for atomic_store_rel on x86, instead of implicitly
locked xchg instruction.  IA32 memory model guarantees that store has
release semantic, since stores cannot pass loads or stores.

Reviewed by:	  bde, jhb
Tested by:	  pho
MFC after:	  2 weeks
2012-06-02 18:10:16 +00:00
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