fixes #221, initial sync*, async, async* implementation

test/codegen/language/async_and_or_test.dart

+// Copyright (c) 2015, 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";
+import "package:async_helper/async_helper.dart";
+
+@NoInline()
+@AssumeDynamic()
+confuse(x) {
+  return x;
+}
+
+test1() async {
+  Expect.isFalse(await confuse(false) && await confuse(false));
+  Expect.isFalse(await confuse(false) && await confuse(true));
+  Expect.isFalse(await confuse(true) && await confuse(false));
+  Expect.isTrue(await confuse(true) && await confuse(true));
+
+  Expect.isFalse(await confuse(false) || await confuse(false));
+  Expect.isTrue(await confuse(false) || await confuse(true));
+  Expect.isTrue(await confuse(true) || await confuse(false));
+  Expect.isTrue(await confuse(true) || await confuse(true));
+}
+
+String trace;
+
+traceA(x) {
+  trace += "a";
+  return x;
+}
+traceB(x) {
+  trace += "b";
+  return x;
+}
+
+testEvaluation(void fn()) async {
+  trace = "";
+  await fn();
+}
+
+test2() async {
+  await testEvaluation(() async {
+    Expect.isFalse(
+        await confuse(traceA(false)) && await confuse(traceB(false)));
+    Expect.equals("a", trace);
+  });
+  await testEvaluation(() async {
+    Expect.isFalse(await confuse(traceA(false)) && await confuse(traceB(true)));
+    Expect.equals("a", trace);
+  });
+  await testEvaluation(() async {
+    Expect.isFalse(await confuse(traceA(true)) && await confuse(traceB(false)));
+    Expect.equals("ab", trace);
+  });
+  await testEvaluation(() async {
+    Expect.isTrue(await confuse(traceA(true)) && await confuse(traceB(true)));
+    Expect.equals("ab", trace);
+  });
+
+  await testEvaluation(() async {
+    Expect.isFalse(
+        await confuse(traceA(false)) || await confuse(traceB(false)));
+    Expect.equals("ab", trace);
+  });
+  await testEvaluation(() async {
+    Expect.isTrue(await confuse(traceA(false)) || await confuse(traceB(true)));
+    Expect.equals("ab", trace);
+  });
+  await testEvaluation(() async {
+    Expect.isTrue(await confuse(traceA(true)) || await confuse(traceB(false)));
+    Expect.equals("a", trace);
+  });
+  await testEvaluation(() async {
+    Expect.isTrue(await confuse(traceA(true)) || await confuse(traceB(true)));
+    Expect.equals("a", trace);
+  });
+
+}
+
+test() async {
+  await test1();
+  await test2();
+}
+
+main() {
+  asyncStart();
+  test().then((_) => asyncEnd());
+}