Add support for if, while, break, continue to js-cps

tests/compiler/dart2js/js_backend_cps_ir_control_flow.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.
+
+// Tests of control flow statements.
+
+library control_flow_tests;
+
+import 'js_backend_cps_ir_test.dart';
+
+const List<TestEntry> tests = const [
+  const TestEntry("""
+main() {
+  while (true);
+}
+""", """
+function() {
+  while (true)
+    ;
+}"""),
+  const TestEntry("""
+foo(a) => a;
+
+main() {
+  while (true) {
+    l: while (true) {
+      while (foo(true)) {
+        if (foo(false)) break l;
+      }
+      print(1);
+    }
+    print(2);
+  }
+}
+""", """
+function() {
+  L0:
+    while (true)
+      while (true) {
+        while (P.identical(V.foo(true), true))
+          if (P.identical(V.foo(false), true)) {
+            P.print(2);
+            continue L0;
+          }
+        P.print(1);
+      }
+}"""),
+  const TestEntry("""
+foo(a) => a;
+
+main() {
+  for (int i = 0; foo(true); i = foo(i)) {
+    print(1);
+    if (foo(false)) break;
+  }
+  print(2);
+}""", """
+function() {
+  var i;
+  i = 0;
+  L1:
+    while (true) {
+      if (P.identical(V.foo(true), true)) {
+        P.print(1);
+        if (!P.identical(V.foo(false), true)) {
+          i = V.foo(i);
+          continue L1;
+        }
+      }
+      P.print(2);
+      return null;
+    }
+}"""),
+const TestEntry("""
+foo(a) => a;
+
+main() {
+ if (foo(true)) {
+   print(1);
+ } else {
+   print(2);
+ }
+ print(3);
+}""", """
+function() {
+  P.identical(V.foo(true), true) ? P.print(1) : P.print(2);
+  P.print(3);
+  return null;
+}"""),
+const TestEntry("""
+foo(a) => a;
+
+main() {
+ if (foo(true)) {
+   print(1);
+   print(1);
+ } else {
+   print(2);
+   print(2);
+ }
+ print(3);
+}""", """
+function() {
+  if (P.identical(V.foo(true), true)) {
+    P.print(1);
+    P.print(1);
+  } else {
+    P.print(2);
+    P.print(2);
+  }
+  P.print(3);
+  return null;
+}"""),
+];