re PR bootstrap/82553 (memory_blockage breaks bootstrap on powerpc)

	PR bootstrap/82553
	* optabs.c (expand_memory_blockage): Fix call of
	targetm.have_memory_blockage.

From-SVN: r253759

gcc/ChangeLog

+2017-10-14  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR bootstrap/82553
+	* optabs.c (expand_memory_blockage): Fix call of
+	targetm.have_memory_blockage.
+
 2017-10-14  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/82548

gcc/optabs.c

@@ -6297,7 +6297,7 @@ expand_asm_memory_blockage (void)
 static void
 expand_memory_blockage (void)
 {
-  if (targetm.have_memory_blockage)
+  if (targetm.have_memory_blockage ())
     emit_insn (targetm.gen_memory_blockage ());
   else
     expand_asm_memory_blockage ();