cfgloopanal.c (variable_initial_value, [...]): Record the fact that initial value is extended from inner mode.

	* cfgloopanal.c (variable_initial_value, variable_initial_values,
	simple_loop_exit_p): Record the fact that initial value is extended
	from inner mode.
	(count_strange_loop_iterations, count_loop_iterations): Handle
	ivs that iterate in a narrower mode. Fix handling of overflows.
	Improve handling of NE conditions.
	(inverse, fits_in_mode_p): New static functions.
	(simple_increment): Detect variables that iterate in a narrower mode.
	* cfgloop.h (struct loop_desc): Fields inner_mode and extend added.

From-SVN: r73275