Fix the arity of a call to a constructor body, now that we pass not just the parameters.

tests/language/constructor8_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Regression test for dart2js that used to crash on this program.
+
+class A {
+  var b;
+
+  // The parameter check here used to confuse the SSA builder when it
+  // created the call to the constructor body.
+  A([Map a]) : b = ?a {
+    Expect.isTrue(b);
+  }
+
+  // The closure in the constructor body used to confuse the SSA builder
+  // when it created the call to the constructor body.
+  A.withClosure(Map a) {
+    var c;
+    var f = () { return c = 42; };
+    b = f();
+    Expect.equals(42, b);
+    Expect.equals(42, c);
+  }
+}
+
+main() {
+  new A(null);
+  new A({});
+  new A.withClosure(null);
+  new A.withClosure({});
+}