Adds support for collecting statistics about code and its metadata.

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 67e9aae114326e8a57f55751115c063882b30712..072fa22f39e4166ba15b94dac3b25fe0bdee0890 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -2236,6 +2236,12 @@ class PagedSpace : public Space {
   // The dummy page that anchors the linked list of pages.
   Page* anchor() { return &anchor_; }
 
+  // Collect code size related statistics
+  void CollectCodeStatistics();
+
+  // Reset code size related statistics
+  static void ResetCodeAndMetadataStatistics(Isolate* isolate);
+
 #ifdef VERIFY_HEAP
   // Verify integrity of this space.
   virtual void Verify(ObjectVisitor* visitor);
@@ -2253,7 +2259,6 @@ class PagedSpace : public Space {
   void ReportStatistics();
 
   // Report code object related statistics
-  void CollectCodeStatistics();
   static void ReportCodeStatistics(Isolate* isolate);
   static void ResetCodeStatistics(Isolate* isolate);
 #endif
@@ -3061,6 +3066,9 @@ class LargeObjectSpace : public Space {
 
   LargePage* first_page() { return first_page_; }
 
+  // Collect code statistics.
+  void CollectCodeStatistics();
+
 #ifdef VERIFY_HEAP
   virtual void Verify();
 #endif
@@ -3068,7 +3076,6 @@ class LargeObjectSpace : public Space {
 #ifdef DEBUG
   void Print() override;
   void ReportStatistics();
-  void CollectCodeStatistics();
 #endif
 
  private: