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dim
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2016-06-12T11:45:45.516936Z
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MFC r300967:

Stop exposing the C11 _Atomic() macro in <sys/cdefs.h>, when compiling
for C++.  It clashes with the one in libc++'s <atomic> header.

(Previously, the _Atomic() macro was defined in <stdatomic.h>, which is
only for use with C11, but for various reasons it was moved to its
current location in r251804.)

Discussed with:	bdrewery, ed

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