ranger: Add range-ops for widen addition and widen multiplication [PR108583]

ranger: Add range-ops for widen addition and widen multiplication [PR108583]

This adds range-ops for widening addition and widening multiplication.

I couldn't figure out how to write a test for this.  It looks like there are
self tests but not a way to write standalone ones?  I did create testcases in
the patch 3/4 which tests the end result.

gcc/ChangeLog:

	PR target/108583
	* gimple-range-op.h (gimple_range_op_handler): Add maybe_non_standard.
	* gimple-range-op.cc (gimple_range_op_handler::gimple_range_op_handler):
	Use it.
	(gimple_range_op_handler::maybe_non_standard): New.
	* range-op.cc (class operator_widen_plus_signed,
	operator_widen_plus_signed::wi_fold, class operator_widen_plus_unsigned,
	operator_widen_plus_unsigned::wi_fold, class operator_widen_mult_signed,
	operator_widen_mult_signed::wi_fold, class operator_widen_mult_unsigned,
	operator_widen_mult_unsigned::wi_fold,
	ptr_op_widen_mult_signed, ptr_op_widen_mult_unsigned,
	ptr_op_widen_plus_signed, ptr_op_widen_plus_unsigned): New.
	* range-op.h (ptr_op_widen_mult_signed, ptr_op_widen_mult_unsigned,
	ptr_op_widen_plus_signed, ptr_op_widen_plus_unsigned): New

Co-Authored-By: Andrew MacLeod <amacleod@redhat.com>