was a vestige of the manual TESTSTRATEGY, and the purpose of it
was to make sure that gdb can read a core file. But (a) the "read
the corefile" part didn't make it to a1-selftest.exp, we just
delete the corefile after creating it, and (b) we test reading
corefiles in corefile.exp anyway. Also, this test left around a
xgdb process on Solaris.
* gdb.base/corefile.exp: Also test backtrace.
when we'll be getting lots of output from gdb.
* gdb.base/a1-selftest.exp: Move code that was inside expect -re
"init_malloc" to after the expect statement. Run it if that
regexp is taken, but also for two others which happen if source
cannot be found.
