[PATCH] [Sanitizers] Do not call internal_sigdelset() on non-Linux

[Alexey Samsonov]

LGTM. If internal_sigdelset is available on FreeBSD (we just shouldn't call it), then I'd prefer if(SANITIZER_LINUX) instead of #if. Anyway, feel free to submit.


http://reviews.llvm.org/D9220

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