Reapply 0489249d29131ed7bf047485c74f557d88eb9974 with a fix for front_end tests.

pkg/kernel/lib/core_types.dart

Index: pkg/kernel/lib/core_types.dart
diff --git a/pkg/kernel/lib/core_types.dart b/pkg/kernel/lib/core_types.dart
index 13c1a63417d9c951ee49f31a5ac86e810f9aeece..2cf0e20c7f76d46db5c4789f3194322ed3e67f4c 100644
--- a/pkg/kernel/lib/core_types.dart
+++ b/pkg/kernel/lib/core_types.dart
@@ -80,6 +80,7 @@ class CoreTypes {
   Constructor _syncIterableDefaultConstructor;
   Constructor _streamIteratorDefaultConstructor;
   Constructor _asyncStarStreamControllerDefaultConstructor;
+  Procedure _asyncStackTraceHelperProcedure;
   Procedure _asyncThenWrapperHelperProcedure;
   Procedure _asyncErrorWrapperHelperProcedure;
   Procedure _awaitHelperProcedure;
@@ -103,6 +104,11 @@ class CoreTypes {
         _index.getMember('dart:async', '_AsyncStarStreamController', '');
   }
 
+  Procedure get asyncStackTraceHelperProcedure {
+    return _asyncStackTraceHelperProcedure ??=
+        _index.getTopLevelMember('dart:async', '_asyncStackTraceHelper');
+  }
+
   Procedure get asyncThenWrapperHelperProcedure {
     return _asyncThenWrapperHelperProcedure ??=
         _index.getTopLevelMember('dart:async', '_asyncThenWrapperHelper');