Compute values of elements a unit constant expressions depend on.

pkg/analyzer/tool/task_dependency_graph/tasks.dot

Index: pkg/analyzer/tool/task_dependency_graph/tasks.dot
diff --git a/pkg/analyzer/tool/task_dependency_graph/tasks.dot b/pkg/analyzer/tool/task_dependency_graph/tasks.dot
index 4c1e06b0889c68f2e1b12f7f5b3bb02c2bf2fbfc..f38607e40b64e3e58221c281218108f391d272d8 100644
--- a/pkg/analyzer/tool/task_dependency_graph/tasks.dot
+++ b/pkg/analyzer/tool/task_dependency_graph/tasks.dot
@@ -31,6 +31,8 @@ digraph G {
   COMPILATION_UNIT_ELEMENT [shape=box]
   CONSTANT_DEPENDENCIES -> ComputeConstantValueTask
   CONSTANT_DEPENDENCIES [shape=box]
+  CONSTANT_EXPRESSIONS_DEPENDENCIES -> EvaluateUnitConstantsTask
+  CONSTANT_EXPRESSIONS_DEPENDENCIES [shape=box]
   CONSTANT_VALUE -> ComputeConstantValueTask
   CONSTANT_VALUE -> EvaluateUnitConstantsTask
   CONSTANT_VALUE [shape=box]
@@ -257,6 +259,7 @@ digraph G {
   ResolveLibraryReferencesTask -> REFERENCED_NAMES
   ResolveLibraryTask -> LIBRARY_ELEMENT
   ResolveLibraryTypeNamesTask -> LIBRARY_ELEMENT5
+  ResolveUnitTask -> CONSTANT_EXPRESSIONS_DEPENDENCIES
   ResolveUnitTask -> RESOLVED_UNIT10
   ResolveUnitTask -> RESOLVE_UNIT_ERRORS
   ResolveUnitTypeNamesTask -> RESOLVED_UNIT3