* doc/posix-functions/aligned_alloc.texi (aligned_alloc):
Mention AddressSanitizer bug.
* lib/alignalloc.h (ALIGNALLOC_VIA_ALIGNED_ALLOC):
Define to 0 if AddressSanitizer is in use.
* tests/test-alignalloc.c (test_alignalloc): New function,
which tests for non-aligned sizes too.
(main): Use it. Don’t bother checking for alignments
greater than 16 MiB, as this flummoxes AddressSanitizer
and there seems little point to testing them.