Do not ignore side effects of a type test or type cast as expression, such

tests/language/language_dart2js.status

Index: tests/language/language_dart2js.status
===================================================================
--- tests/language/language_dart2js.status	(revision 35282)
+++ tests/language/language_dart2js.status	(working copy)
@@ -53,8 +53,10 @@
 malbounded_redirecting_factory2_test/03: Fail # Issue 12825
 malbounded_instantiation_test/01: Fail # Issue 12702
 malbounded_type_cast_test: Fail # Issue 14121
+malbounded_type_cast2_test: Fail # Issue 14121
 malbounded_type_test_test/03: Fail # Issue 14121
 malbounded_type_test_test/04: Fail # Issue 14121
+malbounded_type_test2_test: Fail # Issue 14121
 default_factory2_test/01: Fail # Issue 14121
 typevariable_substitution2_test/01: Crash # Issue 15875
 typevariable_substitution2_test/02: Crash # Issue 15875
@@ -232,12 +234,6 @@
 new_expression_type_args_test/00: Fail # Wrongly reports compile-time error.
 new_expression_type_args_test/01: Fail # Wrongly reports compile-time error.
 
-[ $compiler == dart2dart && $checked ]
-# Dart VM problems
-malbounded_type_cast_test: Fail # Issue 14123
-malbounded_type_test_test/01: Fail # Issue 14131
-malbounded_instantiation_test/01: Fail # Issue 14132
-
 [ $compiler == dart2dart && $minified ]
 cyclic_type_test/0*: Fail # Issue 12605.
 cyclic_type2_test: Fail # Issue 12605.