* coff-rs6000.c (xcoff_howto_table): Fix src_mask entries. Make all

	* coff-rs6000.c (xcoff_howto_table): Fix src_mask entries.  Make all
	relocs with bitsize == 16 have size = 1.
	(xcoff_reloc_type_ba): Correct src_mask and dst_mask adjustment.
	(xcoff_reloc_type_br): Likewise.
	(xcoff_reloc_type_crel): Likewise.
	(xcoff_ppc_relocate_section): Set up src_mask and dst_mask correctly.
	* coff64-rs6000.c (xcoff64_reloc_type_br): Correct src_mask and
	dst_mask adjustment.
	(xcoff64_ppc_relocate_section): Set up src_mask and dst_mask correctly.
	(xcoff64_howto_table): Fix src_mask entries.  Make all relocs with
	bitsize == 16 have size = 1.