More consistently dump GIMPLE FE consumable stmts

More consistently dump GIMPLE FE consumable stmts

The following makes more stmts consumable with the GIMPLE FE
when dumping with -gimple.  In particular addresses in GIMPLE
operand position require wrapping with _Literal.

The TDF_ flag space is now exhausted and I've removed overlaps
and re-ordered things as to how it is supposed to work and
made it uint32_t and prepared the operator overloads for an
easy migration to uint64_t once required.

2021-10-05  Richard Biener  <rguenther@suse.de>

	PR c/102605
	* dumpfile.h (TDF_GIMPLE_VAL): New.
	(dump_flag): Re-order and adjust TDF_* flags.  Make
	the enum uint32_t.  Use std::underlying_type in the
	operator overloads.
	(optgroup_flag): Likewise for the operator overloads.
	* tree-pretty-print.c (dump_generic_node): Wrap ADDR_EXPR
	in _Literal if TDF_GIMPLE_VAL.
	* gimple-pretty-print.c (dump_gimple_assign): Add
	TDF_GIMPLE_VAL to flags when dumping operands where only
	is_gimple_val are allowed.
	(dump_gimple_cond): Likewise.