__tls_get_addr_opt stubs and tocsave optimization

__tls_get_addr_opt stubs and tocsave optimization

This patch fixes a bug in the handling of the __tls_get_addr_opt
stub.  Calls via this stub don't have a toc restoring instruction
following the "bl", and the stub itself doesn't have an initial toc
save instruction.  Thus it is incorrect to skip over the first
instruction when a __tls_get_addr call is marked with a tocsave
reloc.

	* elf64-ppc.c (ppc64_elf_relocate_section): Don't skip first
	instruction of __tls_get_addr_opt stub.
	(plt_stub_size): Omit ALWAYS_EMIT_R2SAVE condition when
	dealing with __tls_get_addr_opt stub.
	(build_tls_get_addr_stub, ppc_size_one_stub): Likewise.