Port "Add snapshoting methods for code's metadata."

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index f2aec48787d459fc1b073a74584d1659be4c50d7..f8b84139b85085c1335fdbb2b08718392d059748 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -3816,6 +3816,8 @@ class PcDescriptors : public Object {
  private:
   static const char* KindAsStr(RawPcDescriptors::Kind kind);
 
+  static RawPcDescriptors* New(intptr_t length);
+
   intptr_t Length() const;
   void SetLength(intptr_t value) const;
   void CopyData(GrowableArray<uint8_t>* data);
@@ -3867,6 +3869,10 @@ class Stackmap : public Object {
                           BitmapBuilder* bmap,
                           intptr_t register_bit_count);
 
+  static RawStackmap* New(intptr_t length,
+                          intptr_t register_bit_count,
+                          intptr_t pc_offset);
+
  private:
   void SetLength(intptr_t length) const {
       StoreNonPointer(&raw_ptr()->length_, length);
@@ -3918,6 +3924,7 @@ class ExceptionHandlers : public Object {
   }
 
   static RawExceptionHandlers* New(intptr_t num_handlers);
+  static RawExceptionHandlers* New(const Array& handled_types_data);
 
   // We would have a VisitPointers function here to traverse the
   // exception handler table to visit objects if any in the table.