re PR rtl-optimization/70261 (r234265 causes fails on rs6000)

	PR target/70261
	* rtlanal.c (replace_rtx): Revert 2016-03-16 change.

From-SVN: r234279

gcc/ChangeLog

+2016-03-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/70261
+	* rtlanal.c (replace_rtx): Revert 2016-03-16 change.
+
 2016-03-16  Richard Henderson  <rth@redhat.com>
 	    Richard Biener  <rguenth@suse.de>
 

gcc/rtlanal.c

@@ -2961,16 +2961,7 @@ replace_rtx (rtx x, rtx from, rtx to)
   if (x == 0)
     return 0;
 
-  if (GET_CODE (x) == REG)
-    {
-      if (GET_CODE (from) == REG
-	  && REGNO (x) == REGNO (from))
-	{
-	  gcc_assert (GET_MODE (x) == GET_MODE (from));
-	  return to;
-	}
-    }
-  else if (GET_CODE (x) == SUBREG)
+  if (GET_CODE (x) == SUBREG)
     {
       rtx new_rtx = replace_rtx (SUBREG_REG (x), from, to);