Tweak ppc32 tls_get_addr optimisation

This patch is cosmetic.  It prevents references to __tls_get_addr_opt
(an alias for __tls_get_addr) when the optimisation isn't possible.

	* elf32-ppc.c (ppc_elf_tls_setup): Set no_tls_get_addr_opt if
	not PLT_NEW.

bfd/ChangeLog

@@ -1,3 +1,8 @@
+2015-02-28  Alan Modra  <amodra@gmail.com>
+
+	* elf32-ppc.c (ppc_elf_tls_setup): Set no_tls_get_addr_opt if
+	not PLT_NEW.
+
 2015-02-27  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* elf32-i386.c (need_convert_mov_to_lea): New.

bfd/elf32-ppc.c

@@ -5093,6 +5093,9 @@ ppc_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
   htab = ppc_elf_hash_table (info);
   htab->tls_get_addr = elf_link_hash_lookup (&htab->elf, "__tls_get_addr",
 					     FALSE, FALSE, TRUE);
+  if (htab->plt_type != PLT_NEW)
+    htab->params->no_tls_get_addr_opt = TRUE;
+
   if (!htab->params->no_tls_get_addr_opt)
     {
       struct elf_link_hash_entry *opt, *tga;