[PATCH origin/google/grte/v5-2.27/master] nptl: use mmap and munmap for stack allocation

[Nilay Vaish]

We made this change so that we can capture thread stack allocations.
__mmap and __munmap cannot be overridden at runtime.  mmap and munmap
can be overidden at runtime and we are thus able to capture when either
of these functions were called.
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