Fix some tests and exclude others from CRLF rewriting.

tests/compiler/dart2js_extra/string_interpolation_dynamic_test.dart

 // Copyright (c) 2014, 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.
 
+// Note: This test relies on LF line endings in the source file.
+
 import "package:expect/expect.dart";
 import 'dart:math';
 
 // Test that String interpolation works in the code generated by the leg
 // compiler.
 
 bool get inscrutableFalse => new Random().nextDouble() > 2;
 
 inscrutable(x) => inscrutableFalse ? [] : x;
 
@@ skipping 108 matching lines @@
   // Lotsa-nested.
   Expect.equals("42", "${'${"${'${"${'${"$b"}'}"}'}"}'}");
 }
 
 
 void main() {
   testSimple();
   testMultiLine();
   testEscapes();
 }