[PATCH] Add testcase for PR56398

[Marek Polacek]

This adds a reduced testcase for PR56398.  Ok for trunk?

2013-02-21  Marek Polacek  <pola...@redhat.com>

        PR tree-optimization/56398
        * g++.dg/torture/pr56398.C: New test. 

--- gcc/g++.dg/torture/pr56398.C.mp     2013-02-21 10:58:14.388913070 +0100
+++ gcc/g++.dg/torture/pr56398.C        2013-02-21 10:58:53.301026474 +0100
@@ -0,0 +1,22 @@
+// { dg-do compile }
+// { dg-options "-g" }
+
+namespace
+{
+#0 "/usr/include/c/4.8/bits/postypes.h" 3
+}
+
+vtkpow (int b)
+{
+  int a1;
+  int b1;
+  int c;
+  while (b1)
+    {
+      while (b)
+    b1 = 0;
+      b1 = b1 - 1;
+      c = c * a1;
+    }
+  return c;
+}

        Marek