[Bug sanitizer/71480] ASan should align string constants to shadow granularity.

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71480

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It most likely affects powerpc* too.  Anyway, patch LGTM, preapproved for trunk
with proper ChangeLog and if possible some reduced testcase (e.g. remove all
headers, replace mkstemp/unlink/fstat functions with (differently named)
noinline/noclone functions that just return/fill in what you need, without any
fs access etc., and define your own struct stat (again, rename it).