soxstack: slience 32-bit gcc warning

Modern GCC complains when casting pointers to integers of a different
size (even a larger one). Switch from uint64_t to uintptr_t which will
always be the right

soxstack: slience 32-bit gcc warning

Modern GCC complains when casting pointers to integers of a different
size (even a larger one). Switch from uint64_t to uintptr_t which will
always be the right size for a stack address instead of maybe being too
big.

Reviewed by: dchagin, emaste
Differential Revision: https://reviews.freebsd.org/D45087

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soxstack: silence GCC warning

Add parens around _STACK_FLAG_GROWS expression to fix GCC warning about
arithmetic in operand of '|'.

Sponsored by: The FreeBSD Foundation

tests: Add stack grows tests

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D41320
MFC after: 2 weeks