Use READY_RESOLVED_UNIT flag for ordering tasks.

pkg/analyzer/tool/task_dependency_graph/tasks.dot

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script
 // "pkg/analyzer/tool/task_dependency_graph/generate.dart".
 //
 // To render this graph using Graphviz (www.graphviz.org) use the command:
 // "dot tasks.dot -Tpdf -O".
@@ skipping 168 matching lines @@
   PropagateVariableTypesInUnitTask -> RESOLVED_UNIT6
   READY_LIBRARY_ELEMENT2 -> ComputeLibraryCycleTask
   READY_LIBRARY_ELEMENT2 -> ReadyLibraryElement2Task
   READY_LIBRARY_ELEMENT2 [shape=box]
   READY_LIBRARY_ELEMENT5 -> PartiallyResolveUnitReferencesTask
   READY_LIBRARY_ELEMENT5 -> ReadyLibraryElement5Task
   READY_LIBRARY_ELEMENT5 [shape=box]
   READY_LIBRARY_ELEMENT6 -> PropagateVariableTypesInLibraryClosureTask
   READY_LIBRARY_ELEMENT6 -> ReadyLibraryElement6Task
   READY_LIBRARY_ELEMENT6 [shape=box]
+  READY_RESOLVED_UNIT -> InferInstanceMembersInUnitTask
+  READY_RESOLVED_UNIT -> InferStaticVariableTypeTask
+  READY_RESOLVED_UNIT -> PartiallyResolveUnitReferencesTask
+  READY_RESOLVED_UNIT -> ResolveInstanceFieldsInUnitTask
   READY_RESOLVED_UNIT -> ResolveLibraryTask
   READY_RESOLVED_UNIT -> VerifyUnitTask
   READY_RESOLVED_UNIT [shape=box]
   READY_RESOLVED_UNIT10 -> ReadyResolvedUnit10Task
   READY_RESOLVED_UNIT10 [shape=box]
   READY_RESOLVED_UNIT11 -> ReadyResolvedUnit11Task
   READY_RESOLVED_UNIT11 [shape=box]
   REFERENCED_NAMES [shape=box]
   RESOLVED_UNIT -> GenerateHintsTask
   RESOLVED_UNIT -> GenerateLintsTask
@@ skipping 27 matching lines @@
   RESOLVED_UNIT5 -> PropagateVariableTypesInUnitTask
   RESOLVED_UNIT5 [shape=box]
   RESOLVED_UNIT6 -> InferStaticVariableTypeTask
   RESOLVED_UNIT6 -> InferStaticVariableTypesInUnitTask
   RESOLVED_UNIT6 -> PropagateVariableTypesInLibraryTask
   RESOLVED_UNIT6 [shape=box]
   RESOLVED_UNIT7 -> ResolveInstanceFieldsInUnitTask
   RESOLVED_UNIT7 [shape=box]
   RESOLVED_UNIT8 -> InferInstanceMembersInUnitTask
   RESOLVED_UNIT8 [shape=box]
-  RESOLVED_UNIT9 -> InferInstanceMembersInUnitTask
-  RESOLVED_UNIT9 -> InferStaticVariableTypeTask
-  RESOLVED_UNIT9 -> PartiallyResolveUnitReferencesTask
-  RESOLVED_UNIT9 -> ResolveInstanceFieldsInUnitTask
   RESOLVED_UNIT9 -> ResolveUnitTask
   RESOLVED_UNIT9 [shape=box]
   RESOLVE_TYPE_NAMES_ERRORS -> LibraryUnitErrorsTask
   RESOLVE_TYPE_NAMES_ERRORS [shape=box]
   RESOLVE_UNIT_ERRORS -> LibraryUnitErrorsTask
   RESOLVE_UNIT_ERRORS [shape=box]
   ReadyLibraryElement2Task -> READY_LIBRARY_ELEMENT2
   ReadyLibraryElement5Task -> READY_LIBRARY_ELEMENT5
   ReadyLibraryElement6Task -> READY_LIBRARY_ELEMENT6
   ReadyResolvedUnit10Task -> READY_RESOLVED_UNIT10
@@ skipping 49 matching lines @@
   VARIABLE_REFERENCE_ERRORS -> LibraryUnitErrorsTask
   VARIABLE_REFERENCE_ERRORS [shape=box]
   VERIFY_ERRORS -> LibraryUnitErrorsTask
   VERIFY_ERRORS [shape=box]
   VerifyUnitTask -> VERIFY_ERRORS
   dartErrorsForSource -> DartErrorsTask
   dartErrorsForSource [shape=hexagon]
   dartErrorsForUnit -> DartErrorsTask
   dartErrorsForUnit [shape=hexagon]
 }