* tree.h (TYPE_STRING_FLAG): Document that this field may be used

	* tree.h (TYPE_STRING_FLAG): Document that this field may be used
	on INTEGER_TYPEs to indicate that it denotes a character type.
	* tree.c (build_common_tree_nodes): Set TYPE_STRING_FLAG on
	signed_char_type_node, unsigned_char_type_node and char_type_node.
	* dwarf2out.c (base_type_die): Treat CHAR_TYPE identically to
	INTEGER_TYPE.  Use TYPE_STRING_FLAG to decide whether to emit
	a DW_ATE_[un]signed_char instead of a DW_ATE_[un]signed.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@110536 138bc75d-0d04-0410-961f-82ee72b054a4