[Bug build/31316] Fails test misc/tst-dirname "Didn't expect signal from child: got `Illegal instruction'" on non SSE CPUs

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31316

--- Comment #2 from Sam James <sam at gentoo dot org> ---
I got access to an environment where it reproduces.

Oops:
```
Thread 2.1 "ld-linux.so.2" received signal SIGILL, Illegal instruction.
[Switching to process 27432]
0xb7f4ccff in __memrchr_sse2 () from
/var/tmp/portage/sys-libs/glibc-9999/work/build-x86-i686-pc-linux-gnu-nptl/libc.so.6
(gdb) bt
#0  0xb7f4ccff in __memrchr_sse2 () from
/var/tmp/portage/sys-libs/glibc-9999/work/build-x86-i686-pc-linux-gnu-nptl/libc.so.6
#1  0xb7ec7906 in dirname () from
/var/tmp/portage/sys-libs/glibc-9999/work/build-x86-i686-pc-linux-gnu-nptl/libc.so.6
#2  0xb7fbf5d9 in ?? ()
#3  0xb7fbf684 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)
```

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