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[Sanitizers] The MAP_NORESERVE define has been removed in FreeBSD 11.x,

Description

[Sanitizers] The MAP_NORESERVE define has been removed in FreeBSD 11.x,
and even before that, it was never implemented. Just define it to zero
instead, so compiler-rt can compile on FreeBSD 11 and later.

Differential Revision: http://reviews.llvm.org/D7485

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