* lto-streamer-out.c (hash_string_slot_node): Hash string based on its
length.
(string_slot_free): Remove
(create_output_block): Initialize obstack.
(destroy_output_block): Free obstack.
(lto_string_index): Add PERSISTENT parameter; do not duplicate
the string unless it needs to be added into the hash.
(lto_output_string_with_length): Add persistent attribute;
handle NULL strings.
(lto_output_string): Add PERSISTENT parameter.
(output_string_cst, output_identifier): Simplify.
(lto_output_location_bitpack): Update.
(lto_output_builtin_tree): Update.
* lto-streamer.h (struct output_block): Add obstack.
(lto_output_string, lto_output_string_with_length): Remove declarations;
functions are static now.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@174397
138bc75d-0d04-0410-961f-
82ee72b054a4