* lib/mi-support.exp: (mi_run_to_helper, mi_run_to,
mi_step_to, mi_next_to, mi_continue_to, mi_finish_to,
mi0_step_to, mi0_next_to, mi0_continue_to, mi0_finish_to,
mi0_run_to): New functions.
* gdb.mi/mi-simplerun.exp: Use them.
* gdb.mi/mi0-simplerun.exp: Likewise.
* gdb.mi/mi-var-cmd.exp: Likewise.
* gdb.mi/mi0-var-cmd.exp: Likewise.