New test for PR56398.

From-SVN: r196199

gcc/testsuite/ChangeLog

+2013-02-21  Marek Polacek  <polacek@redhat.com>
+
+	PR tree-optimization/56398
+	* g++.dg/torture/pr56398.C: New test. 
+
 2013-02-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR inline-asm/56405

gcc/testsuite/g++.dg/torture/pr56398.C

+// { 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;
+}