re PR target/71103 (avr-gcc crashes with unrecognizable insn error)

	PR target/71103
	* config/avr/avr.md (movqi): Only handle loading subreg:qi of
	constant addresses if can_create_pseudo_p.

From-SVN: r237635

gcc/ChangeLog

+2016-06-21  Georg-Johann Lay  <avr@gjlay.de>
+
+	PR target/71103
+	* config/avr/avr.md (movqi): Only handle loading subreg:qi of
+	constant addresses if can_create_pseudo_p.
+
 2016-06-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/71588

gcc/config/avr/avr.md

@@ -643,8 +643,9 @@
 
     if (QImode == <MODE>mode
         && SUBREG_P (src)
-        && CONSTANT_ADDRESS_P (SUBREG_REG (src)))
-    {
+        && CONSTANT_ADDRESS_P (SUBREG_REG (src))
+        && can_create_pseudo_p())
+      {
         // store_bitfield may want to store a SYMBOL_REF or CONST in a
         // structure that's represented as PSImode.  As the upper 16 bits
         // of PSImode cannot be expressed as an HImode subreg, the rhs is