Fix various inheritance bugs

tests/language/language.status

Index: tests/language/language.status
===================================================================
--- tests/language/language.status	(revision 14582)
+++ tests/language/language.status	(working copy)
@@ -19,9 +19,6 @@
 part_test: Fail
 part2_test: Fail
 gc_test: Fail # Issue 1487
-field_override_test/none: Fail  # Issue 742: field shadowing now allowed
-field_override_test/01: Fail    # Issue 742: field shadowing now allowed
-super_field_access_test: Fail    # Issue 742: field shadowing now allowed
 pseudo_kw_illegal_test/14: Fail  # Issue 356
 
 # These bugs refer currently ongoing language discussions.
@@ -69,8 +66,8 @@
 gc_test: Skip  # Takes too long.
 
 [ $compiler == none && $unchecked ]
-field_override_test/02: Fail    # Issue 742: field shadowing now allowed
 
+
 # Only checked mode reports an error on type assignment
 # problems in compile time constants.
 compile_time_constant_checked_test/02: Fail, OK
@@ -139,7 +136,6 @@
 factory5_test/00: Fail # issue 3079
 field_method4_negative_test: Fail  # Runtime only test, rewrite as multitest
 field7_negative_test: Fail, OK # language changed, test issue 5249
-field7a_negative_test: Fail, OK # language changed, test issue 5249
 first_class_types_literals_test: Fail # issue 6283
 getter_no_setter_test/01: Fail # Fails to detect compile-time error.
 getter_no_setter2_test/01: Fail # Fails to detect compile-time error.
@@ -157,8 +153,6 @@
 many_overridden_no_such_method_test: Fail
 no_such_method_negative_test: Fail # Runtime only test, rewrite as multitest
 override_field_test/03: Fail # still a valid test? Issue 3894
-override_field_test/04: Fail # still a valid test? Issue 3656
-override_field_method3_negative_test: Fail, OK # test issue 5249
 override_field_method6_negative_test: Fail, OK # test issue 5249
 overridden_no_such_method_test: Fail
 parameter_initializer6_negative_test: Fail # language change 4288
@@ -457,7 +451,6 @@
 named_parameters_aggregated_test/03: Fail # http://dartbug.com/5519
 named_parameters_aggregated_test/04: Fail # http://dartbug.com/5519
 not_enough_positional_arguments_test/01: Fail # http://dartbug.com/5519
-override_field_test/04: Fail # http://dartbug.com/5519
 static_field3_test/01: Fail # http://dartbug.com/5519
 static_field3_test/02: Fail # http://dartbug.com/5519
 static_field3_test/03: Fail # http://dartbug.com/5519
@@ -501,7 +494,6 @@
 field4_negative_test: Fail
 field5_negative_test: Fail
 field6a_negative_test: Fail
-field7a_negative_test: Fail
 interface_factory_constructor_negative_test: Fail
 interface_static_method_negative_test: Fail
 non_const_super_negative_test: Fail
@@ -543,11 +535,7 @@
 constructor5_test: Fail
 constructor6_test: Fail
 closure_in_initializer_test: Fail
-field_override_test/01: Fail
-field_override_test/02: Fail
-field_override_test/none: Fail
 gc_test: Fail
-super_field_access_test: Fail
 super_first_constructor_test: Fail
 # VM specific tests.
 disable_privacy_test: Fail, Ok