[Bug 276597] cannot build world with WITH_ASAN configured

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276597

--- Comment #13 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Dimitry Andric from comment #12)
The build succeeds for me, thank you.

When I try to boot a VM built from a world compiled with WITH_ASAN, every
executable segfaults.  The crash is happening in libc, in
__archlevel_resolve().  Specifically, the "environ == NULL" check in
env_archlevel() is somehow triggering a segfault - I think the assembly is
checking the shadow map but it's not set up yet.

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