dart2js: Initial implementation of inlining.

tests/compiler/dart2js/js_backend_cps_ir_codeUnitAt_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.
 
 // Tests for constant folding and lowering String.codeUnitAt.
 
 library basic_tests;
 
 import 'js_backend_cps_ir.dart';
 
 const List<TestEntry> tests = const [
 
   // Constant folding.
   const TestEntry(r"""
 main() {
   print('A'.codeUnitAt(0));
 }""",r"""
 function() {
-  P.print(65);
+  var v0 = H.S(65);
+  if (typeof dartPrint == "function")
+    dartPrint(v0);
+  else if (typeof console == "object" && typeof console.log != "undefined")
+    console.log(v0);
+  else if (!(typeof window == "object")) {
+    if (!(typeof print == "function"))
+      throw "Unable to print message: " + String(v0);
+    print(v0);
+  }
 }"""),
 
 
   // Bounds checking.
   const TestEntry.forMethod('function(foo)',
 r"""
 foo(s) {
   var sum = 0;
   for (int i = 0; i < s.length; i++) sum += s.codeUnitAt(i);
   return sum;
 }
 main() {
   print(foo('ABC'));
   print(foo('Hello'));
 }""",r"""
 function(s) {
   var v0 = s.length, sum = 0, i = 0;
   for (; i < v0; sum = sum + s.charCodeAt(i), i = i + 1)
     ;
   return sum;
 }"""),
 ];
 
 
 void main() {
   runTests(tests);
 }