* dwarf2read.c (struct comp_unit_head): Remove dwarf2_abbrevs array.

	* dwarf2read.c (struct comp_unit_head): Remove dwarf2_abbrevs array.
	(struct dwarf2_cu): Add abbrev_obstack and dwarf2_abbrevs
	pointer.  Update comment about comp_unit_head.
	(struct abbrev_info): Shorten two int flags.
	(dwarf_alloc_abbrev): Take a CU argument.
	(dwarf2_build_psymtabs_hard): Call dwarf2_free_abbrev_table
	each time through the loop.  Update cleanup argument.
	(psymtab_to_symtab_1): Update cleanup call.
	(dwarf2_read_abbrevs, dwarf2_alloc_abbrev): Allocate on the
	abbrev_obstack.
	(dwarf2_free_abbrev_table): Renamed from dwarf2_empty_abbrev_table.
	Just call obstack_free and clear the pointer.