* powerpc.cc (Target_powerpc::Scan::reloc_needs_plt_for_ifunc): Make
	static and public.  Add report_err param.  Return false for data refs.
	(Target_powerpc::rela_dyn_section): New overloaded function.
	(Target_powerpc::plt_, iplt_): Elucidate.
	(Output_data_plt_powerpc::entry_count): Handle current_data_size()==0.
	(Output_data_plt_powerpc::do_write): Don't write .iplt.
	(Output_data_plt_powerpc::plt_entry_count): Don't add .iplt entries.
	(Target_powerpc::Scan::local, global): Adjust reloc_needs_plt_for_ifunc
	calls.  Put ifunc dynamic relocs in irela_dyn_section.  Only
	push_branch and make_plt_entry for ifunc syms when
	reloc_needs_plt_for_ifunc.
	(Target_powerpc::Relocate::relocate): Don't use plt entry value
	for ifunc unless reloc_needs_plt_for_ifunc.