Revert "Proper sequencing of _asyncStackTraceHelper in Kernel"

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 98732bfc7f8116eb136c76bf1f670da6288ff1f3..70630430c7e1cff42a7c4143019f2b11de651fca 100644
--- a/pkg/kernel/lib/core_types.dart
+++ b/pkg/kernel/lib/core_types.dart
@@ -77,7 +77,6 @@ class CoreTypes {
   Constructor _syncIterableDefaultConstructor;
   Constructor _streamIteratorDefaultConstructor;
   Constructor _asyncStarStreamControllerDefaultConstructor;
-  Procedure _asyncStackTraceHelperProcedure;
   Procedure _asyncThenWrapperHelperProcedure;
   Procedure _asyncErrorWrapperHelperProcedure;
   Procedure _awaitHelperProcedure;
@@ -101,11 +100,6 @@ 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');