gdb: add maybe_switch_inferior function

gdb: add maybe_switch_inferior function

Add the maybe_switch_inferior function, which ensures that the given
inferior is the current one.  Return an instantiated
scoped_restore_current_thread object only we actually needed to switch
inferior.

Returning a scoped_restore_current_thread requires it to be
move-constructible, so give it a move constructor.

Change-Id: I1231037102ed6166f2530399e8257ad937fb0569
Reviewed-By: Pedro Alves <pedro@palves.net>