dart2js cps: Handle checks against mutable and extendable lists.

tests/compiler/dart2js_native/dart2js_native.status

Index: tests/compiler/dart2js_native/dart2js_native.status
diff --git a/tests/compiler/dart2js_native/dart2js_native.status b/tests/compiler/dart2js_native/dart2js_native.status
index 9798091d3d8ef64da687249272c86ed38a419c06..b8966304298eebf75c7ad29aed7c7080dcfef3d7 100644
--- a/tests/compiler/dart2js_native/dart2js_native.status
+++ b/tests/compiler/dart2js_native/dart2js_native.status
@@ -23,7 +23,6 @@ compute_this_script_test: Skip # Issue 17458
 [ $compiler == dart2js && $cps_ir ]
 compute_this_script_test: RuntimeError # receiver.get$_collection$_nums is not a function
 event_loop_test: RuntimeError # receiver.get$_collection$_nums is not a function
-inference_of_helper_methods_test: RuntimeError # Please triage this failure.
 internal_library_test: RuntimeError # receiver.get$_collection$_nums is not a function
 mirror_intercepted_field_test: Crash # Internal Error: No default constructor available.
 native_closure_identity_frog_test: RuntimeError # invoke is not a function
@@ -32,7 +31,6 @@ native_exception_test: RuntimeError # J.getInterceptor(...).toString$0 is not a
 native_method_inlining_test: RuntimeError # Please triage this failure.
 native_mirror_test: Crash # Internal Error: No default constructor available.
 native_mixin_field_test: RuntimeError # Please triage this failure.
-native_mixin_with_plain_test: RuntimeError # Please triage this failure.
 native_no_such_method_exception3_frog_test: RuntimeError # Please triage this failure.
 native_wrapping_function3_frog_test: RuntimeError # invoke is not a function
 native_wrapping_function_frog_test: RuntimeError # invoke is not a function