* dwarf2out.c (debug_str_hash): New.
(struct indirect_string_node): New.
(struct dw_val_struct): Change type of val_str to it.
(DEBUG_STR_SECTION_FLAGS): Define.
(add_AT_string): Push string into hashtable, increment reference
counter.
(AT_string): Return string from ht_identifier.
(AT_string_form): New.
(free_AT): For dw_val_class_str, just decrement reference counter.
(size_of_string): Remove.
(size_of_die): Use AT_string_form to decide what size the string
occupies in DIE.
(size_of_pubnames): Use strlen instead of size_of_string.
(value_format): Use AT_string_form for dw_val_class_str.
(output_die): Output DW_FORM_strp strings using
dw2_asm_output_offset.
(indirect_string_alloc, output_indirect_string): New.
(dwarf2out_finish): Emit .debug_str strings if there are any.
From-SVN: r46858
