Replace vrp_val* with wide_ints.

This patch removes all uses of vrp_val_{min,max} in favor for a
irange_val_* which are wide_int based.  This will leave only one use
of vrp_val_* which returns trees in range_of_ssa_name_with_loop_info()
because it needs to work with non-integers (floats, etc).  In a
follow-up patch, this function will also be cleaned up such that
vrp_val_* can be deleted.

The functions min_limit and max_limit in range-op.cc are now useless
as they're basically irange_val*.  I didn't rename them yet to avoid
churn.  I'll do it in a later patch.

gcc/ChangeLog:

	* gimple-range-fold.cc (adjust_pointer_diff_expr): Rewrite with
	irange_val*.
	(vrp_val_max): New.
	(vrp_val_min): New.
	* gimple-range-op.cc (cfn_strlen::fold_range): Use irange_val_*.
	* range-op.cc (max_limit): Same.
	(min_limit): Same.
	(plus_minus_ranges): Same.
	(operator_rshift::op1_range): Same.
	(operator_cast::inside_domain_p): Same.
	* value-range.cc (vrp_val_is_max): Delete.
	(vrp_val_is_min): Delete.
	(range_tests_misc): Use irange_val_*.
	* value-range.h (vrp_val_is_min): Delete.
	(vrp_val_is_max): Delete.
	(vrp_val_max): Delete.
	(irange_val_min): New.
	(vrp_val_min): Delete.
	(irange_val_max): New.
	* vr-values.cc (check_for_binary_op_overflow): Use irange_val_*.

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