On OpenBSD 6.0 the test t/exotic_names.t fails sometimes. (RT#117072)

On OpenBSD 6.0 the test t/exotic_names.t fails sometimes. (RT#117072)

Program received signal SIGSEGV, Segmentation fault.
0x00000a9bf44b686a in XS_Sub__Name_subname (cv=Variable "cv" is not available.
) at Name.xs:72
72                      else if (*s && s[-1] == '\'') {

(gdb) print s
$1 = 0xa9c6d507000 "test::SOME_y_STASH::SOME_y_NAME"

With OpenBSD malloc randomisation the storage for nameptr is sometimes
at the beginning of the page.  Then accessing s[-1] with s == nameptr
is fatal.