PR70404 S/390: Fix insv expansion.

While the expander accepts general_operand as src operand the risbg
pattern only immediate_operand.  Unfortunately the expander called
force_reg only for VOIDmode constants missing things like
e.g. symbol_refs.  Fixed with the attached patch.

gcc/ChangeLog:

2016-04-01  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	PR target/70404
	* config/s390/s390.c (s390_expand_insv): Check for everything
	constant instead of just VOIDmode stuff.

From-SVN: r234678

gcc/ChangeLog

+2016-04-01  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
+	PR target/70404
+	* config/s390/s390.c (s390_expand_insv): Check for everything
+	constant instead of just VOIDmode stuff.
+
 2016-04-01  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
 
 	PR target/70496

gcc/config/s390/s390.c

@@ -6063,7 +6063,7 @@ s390_expand_insv (rtx dest, rtx op1, rtx op2, rtx src)
     {
       machine_mode mode_s = GET_MODE (src);
 
-      if (mode_s == VOIDmode)
+      if (CONSTANT_P (src))
 	{
 	  /* For constant zero values the representation with AND
 	     appears to be folded in more situations than the (set