Precompilation: Don't look at embedder allocated pages when finalizing the VM isolate.

runtime/vm/pages.h

Index: runtime/vm/pages.h
diff --git a/runtime/vm/pages.h b/runtime/vm/pages.h
index bd4ab5c5822340b37437b18da0e7784d98f1a592..ff1ca156544cbaaeadc8351b416a82ae0351aa09 100644
--- a/runtime/vm/pages.h
+++ b/runtime/vm/pages.h
@@ -52,6 +52,8 @@ class HeapPage {
     return type_;
   }
 
+  bool embedder_allocated() const { return memory_->embedder_allocated(); }
+
   void VisitObjects(ObjectVisitor* visitor) const;
   void VisitObjectPointers(ObjectPointerVisitor* visitor) const;
 
@@ -254,6 +256,7 @@ class PageSpace {
   }
 
   void VisitObjects(ObjectVisitor* visitor) const;
+  void VisitObjectsNoEmbedderPages(ObjectVisitor* visitor) const;
   void VisitObjectPointers(ObjectPointerVisitor* visitor) const;
 
   RawObject* FindObject(FindObjectVisitor* visitor,
@@ -292,7 +295,7 @@ class PageSpace {
 
   // Note: Code pages are made executable/non-executable when 'read_only' is
   // true/false, respectively.
-  void WriteProtect(bool read_only, bool include_code_pages);
+  void WriteProtect(bool read_only);
   void WriteProtectCode(bool read_only);
 
   void AddGCTime(int64_t micros) {