[dart2js] Report an error if throw is used outside of catch expression without an argument.

tests/co19/co19-dart2dart.status

 # 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.
 
 [ $compiler == dart2dart ]
 Language/03_Overview/1_Scoping_A01_t39: Fail # http://dartbug.com/5519
 Language/03_Overview/1_Scoping_A01_t40: Fail # http://dartbug.com/5519
 Language/03_Overview/1_Scoping_A01_t41: Fail # http://dartbug.com/5519
 Language/03_Overview/1_Scoping_A02_t06: Fail # inherited from dart2js
 Language/03_Overview/1_Scoping_A02_t07: Fail # inherited from dart2js
@@ skipping 258 matching lines @@
 Language/10_Expressions/07_Maps_A01_t01: Skip # co19 issue 91: map literals illegal at statement beginning.
 Language/10_Expressions/07_Maps_A02_t01: Fail # http://dartbug.com/5519
 Language/10_Expressions/07_Maps_A02_t02: Fail # http://dartbug.com/5519
 Language/10_Expressions/08_Throw_A01_t01: Fail # inherited from dart2js
 Language/10_Expressions/08_Throw_A03_t02: Fail # inherited from dart2js
 Language/10_Expressions/08_Throw_A03_t03: Fail # inherited from dart2js
 Language/10_Expressions/08_Throw_A04_t01: Fail # inherited from dart2js
 Language/10_Expressions/08_Throw_A05_t01: Fail # inherited from dart2js
 Language/10_Expressions/08_Throw_A05_t02: Fail # inherited from dart2js
 Language/10_Expressions/08_Throw_A05_t03: Fail # inherited from dart2js
-Language/10_Expressions/08_Throw_A06_t01: Fail # BUG: throw outside catch block;
-Language/10_Expressions/08_Throw_A06_t02: Fail # BUG: standalone throw;
-Language/10_Expressions/08_Throw_A06_t03: Fail # BUG: throw outside catch block
-Language/10_Expressions/08_Throw_A06_t04: Fail # BUG: {throw;} doesn't lead to compilation error.
-Language/10_Expressions/08_Throw_A06_t05: Fail # BUG: standalone throw
-Language/10_Expressions/08_Throw_A06_t06: Fail # BUG: standalone throw
 Language/10_Expressions/09_Function_Expressions_A02_t01: Fail # inherited from VM
 Language/10_Expressions/09_Function_Expressions_A04_t01: Fail # BUG: new optional arguments
 Language/10_Expressions/09_Function_Expressions_A06_t01: Fail # inherited from dart2js
 Language/10_Expressions/11_Instance_Creation/1_New_A02_t01: Fail # http://dartbug.com/5519
 Language/10_Expressions/11_Instance_Creation/1_New_A02_t02: Fail # http://dartbug.com/5519
 Language/10_Expressions/11_Instance_Creation/1_New_A02_t03: Fail # inherited from dart2js
 Language/10_Expressions/11_Instance_Creation/1_New_A02_t05: Fail # inherited from dart2js
 Language/10_Expressions/11_Instance_Creation/1_New_A02_t06: Fail # inherited from dart2js
 Language/10_Expressions/11_Instance_Creation/1_New_A02_t07: Fail # inherited from dart2js
 Language/10_Expressions/11_Instance_Creation/1_New_A09_t09: Fail # inherited from VM
@@ skipping 318 matching lines @@
 LibTest/isolate/Isolate/main_A01_t01: Fail, OK
 LibTest/isolate/Isolate/port_A01_t01: Fail, OK
 LibTest/isolate/Isolate/port_A01_t02: Fail, OK
 LibTest/isolate/Isolate/spawn_A01_t01: Fail, OK
 LibTest/isolate/Isolate/spawn_A01_t02: Fail, OK
 LibTest/isolate/Isolate/spawn_A01_t03: Fail, OK
 LibTest/isolate/Isolate/spawn_A01_t04: Fail, OK
 LibTest/isolate/Isolate/spawn_A01_t05: Fail, OK
 LibTest/isolate/Isolate/spawn_A01_t06: Fail, OK
 LibTest/isolate/ReceivePort/receive_A01_t02: Fail # inherited from VM