[Darwin.PPC] Remove dead code.

TARGET_LINK_STACK is unused on Darwin, and only relevant to a processor on
which the port was never released.

2019-07-05  Iain Sandoe  <iain@sandoe.co.uk>

	* config/rs6000/rs6000-logue.c: Remove unused code.

From-SVN: r273148

gcc/ChangeLog

+2019-07-05  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* config/rs6000/rs6000-logue.c: Remove unused code.
+
 2019-07-05  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* tree-ssa-loop-manip.c (create_iv): Add missing guard for gsi_end_p.

gcc/config/rs6000/rs6000-logue.c

@@ -5100,24 +5100,11 @@ macho_branch_islands (void)
 #endif /* DBX_DEBUGGING_INFO || XCOFF_DEBUGGING_INFO */
       if (flag_pic)
 	{
-	  if (TARGET_LINK_STACK)
-	    {
-	      char name[32];
-	      get_ppc476_thunk_name (name);
-	      strcat (tmp_buf, ":\n\tmflr r0\n\tbl ");
-	      strcat (tmp_buf, name);
-	      strcat (tmp_buf, "\n");
-	      strcat (tmp_buf, label);
-	      strcat (tmp_buf, "_pic:\n\tmflr r11\n");
-	    }
-	  else
-	    {
 	  strcat (tmp_buf, ":\n\tmflr r0\n\tbcl 20,31,");
 	  strcat (tmp_buf, label);
 	  strcat (tmp_buf, "_pic\n");
 	  strcat (tmp_buf, label);
 	  strcat (tmp_buf, "_pic:\n\tmflr r11\n");
-	    }
 
 	  strcat (tmp_buf, "\taddis r11,r11,ha16(");
 	  strcat (tmp_buf, name_buf);