* coffcode.h (coff_set_alignment_hook): Write RS6000COFF_C version

	* coffcode.h (coff_set_alignment_hook): Write RS6000COFF_C version
	which checks for STYP_OVRFLO sections.
	(coff_compute_section_file_positions): If RS6000COFF_C, handle
	reloc and lineno count overflows.
	(coff_write_object_contents): Call coff_count_linenumbers before
	coff_compute_section_file_positions.  If RS6000COFF_C, handle
	reloc and lineno count overflows.
	* xcofflink.c (_bfd_xcoff_bfd_final_link): Count line numbers and
	relocs before dealing with .pad sections.  Count overflow section
	headers when handling .pad sections.