pgsql: Replace ia64 S_UNLOCK compiler barrier with a full memory barrie

Replace ia64 S_UNLOCK compiler barrier with a full memory barrier.

_Asm_sched_fence() is just a compiler barrier, not a memory barrier. But
spinlock release on IA64 needs, at the very least, release
semantics. Use a full barrier instead.

This might be the cause for the occasional failures on buildfarm member
anole.

Discussion: 20150629101108.GB17640@alap3.anarazel.de

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/07cb8b02ab4c8b65bb2e3b87ad2402fdc6cce978

Modified Files
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src/include/storage/s_lock.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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