[PATCH] D20409: [LibFuzzer] Fix NumberOfCpuCores() for Mac OSX

[Dan Liew via llvm-commits]

delcypher added a comment.

@kcc I've added a bunch of error checking in this patch too and also replace `fclose()` with `pclose()`. If you don't like these changes I can remove this so this patch only adds Mac OSX support and nothing else.


http://reviews.llvm.org/D20409