Revert "Implement tracing for function expressions and statements, and infer types of parameters of…

tests/compiler/dart2js/closure_tracer_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';
-import "package:async_helper/async_helper.dart";
-
-import 'compiler_helper.dart';
-import 'parser_helper.dart';
-
-const String TEST = '''
-testFunctionStatement() {
-  var res;
-  closure(a) => res = a;
-  closure(42);
-  return res;
-}
-
-testFunctionExpression() {
-  var res;
-  var closure = (a) => res = a;
-  closure(42);
-  return res;
-}
-
-var staticField;
-
-testStoredInStatic() {
-  var res;
-  closure(a) => res = a;
-  staticField = closure;
-  staticField(42);
-  return res;
-}
-
-class A {
-  var field;
-  A(this.field);
-}
-
-testStoredInInstance() {
-  var res;
-  closure(a) => res = a;
-  var a = new A(closure);
-  a.field(42);
-  return res;
-}
-
-foo(closure) {
-  closure(42);
-}
-
-testPassedInParameter() {
-  var res;
-  closure(a) => res = a;
-  foo(closure);
-  return res;
-}
-
-main() {
-  testFunctionStatement();
-  testFunctionExpression();
-  testStoredInStatic();
-  testStoredInInstance();
-  testPassedInParameter();
-}
-''';
-
-void main() {
-  Uri uri = new Uri(scheme: 'source');
-  var compiler = compilerFor(TEST, uri);
-  asyncTest(() => compiler.runCompiler(uri).then((_) {
-    var typesTask = compiler.typesTask;
-    var typesInferrer = typesTask.typesInferrer;
-
-    checkType(String name, type) {
-      var element = findElement(compiler, name);
-      var mask = typesInferrer.getReturnTypeOfElement(element);
-      Expect.equals(type.nullable(), mask.simplify(compiler), name);
-    }
-
-    checkType('testFunctionStatement', typesTask.uint31Type);
-    checkType('testFunctionExpression', typesTask.uint31Type);
-    checkType('testStoredInInstance', typesTask.uint31Type);
-    checkType('testStoredInStatic', typesTask.uint31Type);
-    checkType('testPassedInParameter', typesTask.uint31Type);
-  }));
-}