* dwarf2read.c (ABBREV_HASH_SIZE): Remove enclosing #ifndef/#endif.

	* dwarf2read.c (ABBREV_HASH_SIZE): Remove enclosing #ifndef/#endif.
	(struct abbrev_table): Define.
	(dwarf2_cu): Replace members dwarf2_abbrevs, abbrev_obstack with
	abbrev_table.
	(init_cutu_and_read_dies): Update.
	(abbrev_table_alloc_abbrev): New function.  Replaces
	dwarf_alloc_abbrev.  All callers updated.
	(abbrev_table_add_abbrev): New function.
	(abbrev_table_lookup_abbrev): New function.  Replaces
	dwarf2_lookup_abbrev.  All callers updated.
	(abbrev_table_read_table): New function.  Contents moved here from
	dwarf2_read_abbrevs.
	(dwarf2_read_abbrevs): Call it.
	(abbrev_table_free): New function.
	(dwarf2_free_abbrev_table): Call it.