[Support] Re-add the special OSX flags on mmap.
The problem appears to be that these flags can only be used when mapping a file for read-only, not for readwrite. So we do that here. llvm-svn: 295880
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The problem appears to be that these flags can only be used when mapping a file for read-only, not for readwrite. So we do that here. llvm-svn: 295880