* elf64-ppc.c (get_tls_mask): Add toc_symndx param, save toc

	* elf64-ppc.c (get_tls_mask): Add toc_symndx param, save toc
	reloc symbol index to it.  Don't allow gd syms in shared libs
	to be optimized.
	(ppc64_elf_tls_optimize): Adjust get_tls_mask call.
	(ppc64_elf_size_stubs): Likewise.
	(ppc64_elf_relocate_section): Check that tls relocs are only used
	with tls syms, and similarly for non-tls.  Correct symbol used
	when optimizing toc tls code.