Add support for exception rethrowing using "throw;"

tests/language/language.status

 # Copyright (c) 2011, 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.
 
 # This directory contains tests that are intended to show the
 # current state of the language.
 
 # In order to maintain maximum test coverage for all builds,
 # please use the following procedure to mark a test
 # failed on an architecture other than the one you are working on.
@@ skipping 75 matching lines @@
 InterfaceFactory3NegativeTest: Fail      # Bug 5387405
 GenericParameterizedExtendsTest: Skip  # Bug 5392297
 ConstObjectsAreImmutableTest: Fail  # Bug 5202940
 SuperNegativeTest: Fail # Now that super calls are automatically injected this test doesn't make sense
 NullToStringTest: Fail       # Bug 5421978
 FunctionTypeAliasTest: Crash # Bug 4519208.
 
 # Other bugs (or unimplemented features) in dartc.
 SuperOperatorTest: Fail      # Bug 4995463.
 GenericTest: Fail            # Bug 5393302 (missing call to super constructor)
-Throw7NegativeTest: Fail     # Bug 4208459.
-Throw3Test: Fail             # Bug 4205624.
+TryCatch6NegativeTest: Crash # Bug 5450070
+Throw7NegativeTest: Crash    # Bug 4208459.
 SwitchLabelTest: Fail        # Bug 4208467.
 Switch7NegativeTest: Fail    # Bug 4208467.
 StackOverflowTest: Fail      # Bug 4591172.
 ScopeNegativeTest: Fail      # Bug 4207538.
 PseudoKWNegativeTest: Fail   # Bug 4979760.
 OverriddenNoSuchMethodTest: Fail  # Bug 4202974.
 ManyOverriddenNoSuchMethodTest: Fail  # Bug 4202974.
 NoSuchMethodTest: Fail       # Bug 4202974.
 NumbersTest: Fail            # Fails because numbers are mapped to doubles.
 LocalFunctionTest: Fail      # Bug in test. Bug 4202989 (shadowing).
@@ skipping 66 matching lines @@
 TypedMessageTest: Fail # Bug 5246195
 
 [ $arch == x64 ]
 *: Skip
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == arm ]
 *: Skip