K 10
svn:author
V 6
marius
K 8
svn:date
V 27
2013-08-10T00:00:19.482168Z
K 7
svn:log
V 292
MFC: r241374

Add an unified macro to deny ability from the compiler to reorder
instruction loads/stores at its will.
The macro __compiler_membar() is currently supported for both gcc and
clang, but kernel compilation will fail otherwise.

Reviewed by:	bde, kib
Discussed with:	dim, theraven

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