[api] Make ObjectTemplate::SetNativeDataProperty() work even if the ObjectTemplate does not have a …

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 21e6c70e3582fda1b2fac5197904ae368f464777..1c6e96164cac06cfa8d1322e3188fb800c369be6 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2389,6 +2389,8 @@ class JSObject: public JSReceiver {
       Handle<JSObject> object,
       AllocationSiteUsageContext* site_context,
       DeepCopyHints hints = kNoHints);
+  MUST_USE_RESULT static MaybeHandle<JSObject> DeepCopy(
+      Handle<JSObject> object, DeepCopyHints hints = kNoHints);
   MUST_USE_RESULT static MaybeHandle<JSObject> DeepWalk(
       Handle<JSObject> object,
       AllocationSiteCreationContext* site_context);
@@ -10467,15 +10469,16 @@ class CallHandlerInfo: public Struct {
 class TemplateInfo: public Struct {
  public:
   DECL_ACCESSORS(tag, Object)
-  inline int number_of_properties() const;
-  inline void set_number_of_properties(int value);
+  DECL_ACCESSORS(serial_number, Object)
+  DECL_INT_ACCESSORS(number_of_properties)
   DECL_ACCESSORS(property_list, Object)
   DECL_ACCESSORS(property_accessors, Object)
 
   DECLARE_VERIFIER(TemplateInfo)
 
   static const int kTagOffset = HeapObject::kHeaderSize;
-  static const int kNumberOfProperties = kTagOffset + kPointerSize;
+  static const int kSerialNumberOffset = kTagOffset + kPointerSize;
+  static const int kNumberOfProperties = kSerialNumberOffset + kPointerSize;
   static const int kPropertyListOffset = kNumberOfProperties + kPointerSize;
   static const int kPropertyAccessorsOffset =
       kPropertyListOffset + kPointerSize;
@@ -10490,7 +10493,6 @@ class TemplateInfo: public Struct {
 
 class FunctionTemplateInfo: public TemplateInfo {
  public:
-  DECL_ACCESSORS(serial_number, Object)
   DECL_ACCESSORS(call_code, Object)
   DECL_ACCESSORS(prototype_template, Object)
   DECL_ACCESSORS(parent_template, Object)
@@ -10524,8 +10526,7 @@ class FunctionTemplateInfo: public TemplateInfo {
   DECLARE_PRINTER(FunctionTemplateInfo)
   DECLARE_VERIFIER(FunctionTemplateInfo)
 
-  static const int kSerialNumberOffset = TemplateInfo::kHeaderSize;
-  static const int kCallCodeOffset = kSerialNumberOffset + kPointerSize;
+  static const int kCallCodeOffset = TemplateInfo::kHeaderSize;
   static const int kPrototypeTemplateOffset =
       kCallCodeOffset + kPointerSize;
   static const int kParentTemplateOffset =