dart2js cps: Remove code after calls that cannot return.

tests/compiler/dart2js/js_backend_cps_ir_operators_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.
 
 // Tests of operators.
 
 library operators_tests;
 
 import 'js_backend_cps_ir.dart';
 
 const List<TestEntry> tests = const [
   const TestEntry("main() { return true ? 42 : 'foo'; }"),
   const TestEntry("""
-foo() => foo();
+var x = 1;
+foo() => ++x > 10;
 main() {
   print(foo() ? "hello world" : "bad bad");
 }""","""
 function() {
   P.print(V.foo() ? "hello world" : "bad bad");
 }"""),
   const TestEntry("""
-foo() { print('foo'); }
+var x = 1;
+foo() => ++x > 10;
 main() {
   print(foo() ? "hello world" : "bad bad");
 }""","""
 function() {
-  V.foo();
-  P.print("bad bad");
+  P.print(V.foo() ? "hello world" : "bad bad");
 }"""),
   const TestEntry("""
-get foo => foo;
+var x = 1;
+get foo => ++x > 10;
 main() {
   print(foo ? "hello world" : "bad bad");
 }""","""
 function() {
   P.print(V.foo() ? "hello world" : "bad bad");
 }"""),
   const TestEntry("""
-get foo => foo;
+var x = 1;
+get foo => ++x > 10;
 main() { print(foo && foo); }
 """, """
 function() {
   P.print(V.foo() ? !!V.foo() : false);
 }"""),
   const TestEntry("""
-get foo => foo;
+var x = 1;
+get foo => ++x > 10;
 main() { print(foo || foo); }
 ""","""
 function() {
   P.print(V.foo() ? true : !!V.foo());
 }"""),
+const TestEntry("""
+get foo => foo;
+main() { print(foo || foo); }
+""","""
+function() {
+  V.foo();
+}"""),
 
 // Needs interceptor calling convention
 //const TestEntry("""
 //class Foo {
 //  operator[]=(index, value) {
 //    print(value);
 //  }
 //}
 //main() {
 //  var foo = new Foo();
@@ skipping 15 matching lines @@
   if (v0 < 0 || v0 >= list.length)
     H.ioore(list, v0);
   list[v0] = 6;
   P.print(list);
 }"""),
 ];
 
 void main() {
   runTests(tests);
 }