rs6000: Fix AIX aggregate passing fix

David's fix for the AIX aggregate passing from yesterday unfortunately
also triggers on powerpc64-linux.  This fixes it.


	* config/rs6000/rs6000.c (rs6000_function_arg): Only do the special
	aggregate handling on actual AIX, not on somewhat similar systems.
	(rs6000_arg_partial_bytes): Ditto.

From-SVN: r266811

gcc/ChangeLog

+2018-12-05  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.c (rs6000_function_arg): Only do the special
+	aggregate handling on actual AIX, not on somewhat similar systems.
+	(rs6000_arg_partial_bytes): Ditto.
+
 2018-12-04  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/88317

gcc/config/rs6000/rs6000.c

@@ -11990,7 +11990,7 @@ rs6000_function_arg (cumulative_args_t cum_v, machine_mode mode,
 	cum->fregno++;
 
       if (USE_FP_FOR_ARG_P (cum, elt_mode)
-	  && !(TARGET_AIX && AGGREGATE_TYPE_P (type)))
+	  && !(TARGET_AIX && !TARGET_ELF && AGGREGATE_TYPE_P (type)))
 	{
 	  rtx rvec[GP_ARG_NUM_REG + AGGR_ARG_NUM_REG + 1];
 	  rtx r, off;
@@ -12127,7 +12127,7 @@ rs6000_arg_partial_bytes (cumulative_args_t cum_v, machine_mode mode,
   align_words = rs6000_parm_start (mode, type, cum->words);
 
   if (USE_FP_FOR_ARG_P (cum, elt_mode)
-      && !(TARGET_AIX && AGGREGATE_TYPE_P (type)))
+      && !(TARGET_AIX && !TARGET_ELF && AGGREGATE_TYPE_P (type)))
     {
       unsigned long n_fpreg = (GET_MODE_SIZE (elt_mode) + 7) >> 3;