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fiber: correct native stack bounds on macOS

pthread_get_stackaddr_np() returns the upper boundary of a native
thread stack on macOS. The stack attribute wrapper exposes it as the
lower boundary, so ASan receives an incorrect range during fiber
stack switching.

Apple's libpthread computes the size as stackaddr - stackbottom and
returns stackaddr from pthread_get_stackaddr_np() [1]. Subtract the
native stack size to obtain the lower boundary.

[1] https://github.com/apple-oss-distributions/libpthread/blob/main/src/pthread.c

Part of #13330

NO_DOC=bugfix

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