Regression test for incorrect summary of function with interpolation

tests/compiler/dart2js_extra/17094_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.
+
+import "package:expect/expect.dart";
+
+//  Interpolation effect analysis test.
+
+get never => new DateTime.now().millisecondsSinceEpoch == 0;
+
+class A {
+  int a = 0;
+  toString() { ++a; return 'A'; }
+}
+
+// Many interpolations to make function too big to inline.
+// Summary for [fmt] must include effects from toString().
+fmt(x) => '$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x$x';
+
+test(a) {
+  if (a == null) return;
+  if (never) a.a += 1;
+  var b = a.a;     // field load
+  var c = fmt(a);  // field modified through implicit call to toString()
+  var d = a.a;     // field re-load
+  Expect.equals('A 0 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 30', '$a $b $c $d');
+
+  // Extra use of [fmt] to prevent inlining on basis of single reference.
+  Expect.equals('', fmt(''));
+}
+
+main() {
+  test(null);
+  test(new A());
+}