Reapply "Refactor constant part." (r4958) with fixes.

frog/tests/leg/src/ClosureCodegenTest.dart

 // Copyright (c) 2012, 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.
 // Test that parameters keep their names in the output.
 
 #import("compiler_helper.dart");
 #import("parser_helper.dart");
 
 final String TEST_INVOCATION0 = @"""
 main() {
@@ skipping 25 matching lines @@
   }
 }
 
 main() { new A().foo(); }
 """;
 
 closureInvocation() {
   String generated = compile(TEST_INVOCATION0);
   Expect.isTrue(generated.contains(".\$call\$0()"));
   generated = compile(TEST_INVOCATION1);
-  Expect.isTrue(generated.contains(".\$call\$1(1)"));
+  Expect.isTrue(generated.contains(@".$call$1((1))"));
   generated = compile(TEST_INVOCATION2);
-  Expect.isTrue(generated.contains(".\$call\$2(1, 2)"));
+  Expect.isTrue(generated.contains(@".$call$2((1), (2))"));
 }
 
 // Make sure that the bailout version does not introduce a second version of
 // the closure.
 closureBailout() {
   String generated = compileAll(TEST_BAILOUT);
   RegExp noSuchMethodRegExp = const RegExp(@'Object\.prototype\.\$call\$0');
   bool containsNoSuchMethodAdapter = noSuchMethodRegExp.hasMatch(generated);
   RegExp regexp = const RegExp(@'\$call\$0 = function');
   Iterator<Match> matches = regexp.allMatches(generated).iterator();
   checkNumberOfMatches(matches, containsNoSuchMethodAdapter ? 2 : 1);
 }
 
 main() {
   closureInvocation();
   closureBailout();
 }