Ignore error from mprotect when allocating code area in Mac OS with MAP_JIT.  This seems to be a bug in Mac OS but it's safe to ignore this when reallocating a page that has previously been freed by a GC.
Ignore error from mprotect when allocating code area in Mac OS with MAP_JIT.  This
seems to be a bug in Mac OS but it's safe to ignore this when reallocating a page
that has previously been freed by a GC.

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