Fix up gdb/qemu driver to only load status once, effectively.

     * NB: QEMU's gdb stub removes all breakpoints on '?', so we have to
     * only call this on target attach!  We have to trust our status as
     * TARGET_PAUSED when we call gdb_pause(), if it succeeds.  This
     * must also be the gdb client's default behavior, although I don't
     * think I saw this in the protocol docs.

(And of course gdb stubs always send stop statuses on breakpoint
exception or whatever... so strictly speaking, we don't need to rely on
this call at all.)
1 job for master in 4 minutes and 38 seconds (queued for 7 minutes and 42 seconds)
Status Job ID Name Coverage
passed testing #452