Handle non constant ranges in irange pretty printer.

Technically iranges only exist in constant form, but we allow symbolic
ones before arriving in the ranger, so legacy VRP can work.  This fixes the
ICE when attempting to print symbolic iranges in the pretty printer.

For consistency's sake, I have made sure irange::get_nonzero_bits does
not similarly ICE on a symbolic range, even though no one should be
querying nonzero bits on such a range.  This should all melt away
when legacy disappears, because all these methods are slated for
removal (min, max, kind, symbolic_p, constant_p, etc).

Finally, Richi suggested using pp_wide_int in the pretty printer
instead of going through trees.  I've adapted a test, since
dump_generic_node seems to work slightly different.

	PR tree-optimization/106444

gcc/ChangeLog:

	* value-range-pretty-print.cc (vrange_printer::visit): Handle
	legacy ranges.
	(vrange_printer::print_irange_bound): Work on wide_int's.
	* value-range-pretty-print.h (print_irange_bound): Same.
	* value-range.cc (irange::get_nonzero_bits): Handle legacy ranges.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/evrp4.c: Adjust.

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