* dwarf2read.c (read_and_check_comp_unit_head): Renamed from

	* dwarf2read.c (read_and_check_comp_unit_head): Renamed from
	partial_read_comp_unit_head.  Replace "buffer", "buffer_size" and
	"abfd" args with "section".  All callers updated.
	Error checking code moved ...
	(error_check_comp_unit_head): ... here.  New function.
	(read_and_check_type_unit_head): Renamed from read_type_unit_head.
	Delete arg "abfd".  New arg "type_offset".  All callers updated.
	(create_debug_types_hash_table): Simplify by using
	read_and_check_type_unit_head.