* lib/mi-support.exp (mi_create_varobj_checked): New.

	* lib/mi-support.exp (mi_create_varobj_checked): New.
	(mi_list_varobj_children): Allow to check for a
	value.
	(mi_list_array_varobj_children): New.

	* gdb.mi/mi-var-child.exp: Use mi_create_varobj
	and mi_list_varobj_children, as opposed to hardcoding
	expected strings.
	* gdb.mi/gdb701.exp: Likewise.
	* gdb.mi/gdb792.exp: Likewise.
	* gdb.mi/mi-var-block.exp: Likewise.
	* gdb.mi/mi-var-cmd.exp: Likewise.
	* gdb.mi/mi-var-invalidate.exp: Likewise.
	* gdb.mi/mi2-var-block.exp: Likewise.
	* gdb.mi/mi2-var-child.exp: Likewise.
	* gdb.mi/mi2-var-cmd.exp: Likewise.
	* gdb.mi/mi2-var-display.exp: Likewise.