Generate code that throws an exception on unimplemented features.

dart/tests/co19/co19-leg.status

Index: dart/tests/co19/co19-leg.status
diff --git a/dart/tests/co19/co19-leg.status b/dart/tests/co19/co19-leg.status
index 28e18cc87da7ddf529f51e5eeb1d113a251e3171..c242338f0a7145c8af3f8a478074fb70be0d95c3 100644
--- a/dart/tests/co19/co19-leg.status
+++ b/dart/tests/co19/co19-leg.status
@@ -139,7 +139,6 @@ LibTest/core/List/every_A04_t01: Fail # Cannot find value.
 LibTest/core/List/filter_A01_t01: Fail # Cannot find value.
 LibTest/core/List/filter_A01_t02: Fail # Cannot find value.
 LibTest/core/List/filter_A04_t01: Fail # Cannot find value.
-LibTest/core/List/sort_A01_t01: Fail # visitContinueStatement not implemented
 LibTest/core/List/sort_A01_t02: Fail # non-empty instruction stack
 LibTest/core/List/sort_A01_t03: Fail # Cannot find value.
 LibTest/core/Map/Map_class_A01_t04: Fail # SsaBuilder.visitContinueStatement not implemented
@@ -292,7 +291,6 @@ LibTest/core/ReceivePort/ReceivePort.singleShot_A01_t01: Fail # factory ReceiveP
 Language/07_Classes/5_Constructors/2_Factories_A01_t01: Fail # lib is not a type
 Language/05_Variables/05_Variables_A05_t03: Fail # map not implemented
 Language/05_Variables/05_Variables_A08_t03: Fail # map not implemented
-Language/06_Functions/06_Functions_A01_t03: Fail # map not implemented
 LibTest/core/HashMap/HashMap.from_A01_t01: Fail # map not implemented
 LibTest/core/LinkedHashMap/LinkedHashMap.from_A01_t01: Fail # map not implemented
 LibTest/core/RegExp/Pattern_semantics/firstMatch_CharacterEscape_A07_t01: Fail # map not implemented