tree.h: Remove DECL_BY_REFERENCE from private_flag comment.

	* tree.h: Remove DECL_BY_REFERENCE from private_flag comment.
	(struct tree_base): Adjust spacing for 8 bit boundaries.
	(struct tree_decl_common): Add decl_by_reference_flag bit.
	(DECL_BY_REFERENCE): Adjust.
	* print-tree.c (print_node): For VAR_DECL, PARM_DECL or RESULT_DECL,
	print DECL_BY_REFERENCE bit.
	* dbxout.c (DECL_ACCESSIBILITY_CHAR): Revert last change.
	* dwarf2out.c (loc_by_reference, gen_decl_die): Check
	DECL_BY_REFERENCE for all VAR_DECLs, not just non-static ones.
	(gen_variable_die): Likewise.  Check TREE_PRIVATE/TREE_PROTECTED
	unconditionally.

From-SVN: r147135