Non-tree-shaking --precompile.

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index f336109d79e15d840de010e2f3053b48533690d7..990d2339cb0632d122158610da12a7f96057e78e 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -693,6 +693,11 @@ class Isolate : public BaseIsolate {
   RawUserTag* default_tag() const { return default_tag_; }
   void set_default_tag(const UserTag& tag);
 
+  RawGrowableObjectArray* collected_closures() const {
+    return collected_closures_;
+  }
+  void set_collected_closures(const GrowableObjectArray& value);
+
   Metric* metrics_list_head() {
     return metrics_list_head_;
   }
@@ -707,6 +712,11 @@ class Isolate : public BaseIsolate {
   void set_deoptimized_code_array(const GrowableObjectArray& value);
   void TrackDeoptimizedCode(const Code& code);
 
+  bool compilation_allowed() const { return compilation_allowed_; }
+  void set_compilation_allowed(bool allowed) {
+    compilation_allowed_ = allowed;
+  }
+
 #if defined(DEBUG)
 #define REUSABLE_HANDLE_SCOPE_ACCESSORS(object)                                \
   void set_reusable_##object##_handle_scope_active(bool value) {               \
@@ -846,12 +856,16 @@ class Isolate : public BaseIsolate {
   RawGrowableObjectArray* tag_table_;
   RawUserTag* current_tag_;
   RawUserTag* default_tag_;
+
+  RawGrowableObjectArray* collected_closures_;
   RawGrowableObjectArray* deoptimized_code_array_;
 
   Metric* metrics_list_head_;
 
   Counters counters_;
 
+  bool compilation_allowed_;
+
   // TODO(23153): Move this out of Isolate/Thread.
   CHA* cha_;