Support BottomType in the VM Kernel reader

runtime/vm/kernel_to_il.cc

Index: runtime/vm/kernel_to_il.cc
diff --git a/runtime/vm/kernel_to_il.cc b/runtime/vm/kernel_to_il.cc
index 392ada66538ef3ff4e65c38f6bd6c3df4bb76ebe..167bf2a1688b24f0a7d85a175cef6e8763a983b5 100644
--- a/runtime/vm/kernel_to_il.cc
+++ b/runtime/vm/kernel_to_il.cc
@@ -4843,6 +4843,12 @@ void DartTypeTranslator::VisitVoidType(VoidType* node) {
 }
 
 
+void DartTypeTranslator::VisitBottomType(BottomType* node) {
+  result_ =
+      dart::Class::Handle(Z, I->object_store()->null_class()).CanonicalType();

[Kevin Millikin (Google), 2017/05/03 21:01:06]

This is the only interesting code.  Is this the right type?  Regis, is there a
better way?  There are accessors for dynamic_type and void_type in Object, but
nothing for this type.

[regis, 2017/05/04 09:35:10]

This should be fine.

+}
+
+
 const TypeArguments& DartTypeTranslator::TranslateTypeArguments(
     DartType** dart_types,
     intptr_t length) {