[api] Support sharing prototypes between FunctionTemplates

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index e294e534a358de47784ac80e63cd33f3da038a7a..5c888d1cd49746deeaabc4afd4d72fffefb5d1f9 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -11548,6 +11548,7 @@ class FunctionTemplateInfo: public TemplateInfo {
  public:
   DECL_ACCESSORS(call_code, Object)
   DECL_ACCESSORS(prototype_template, Object)
+  DECL_ACCESSORS(prototype_provider_template, Object)
   DECL_ACCESSORS(parent_template, Object)
   DECL_ACCESSORS(named_property_handler, Object)
   DECL_ACCESSORS(indexed_property_handler, Object)
@@ -11585,8 +11586,10 @@ class FunctionTemplateInfo: public TemplateInfo {
   static const int kCallCodeOffset = TemplateInfo::kHeaderSize;
   static const int kPrototypeTemplateOffset =
       kCallCodeOffset + kPointerSize;
-  static const int kParentTemplateOffset =
+  static const int kPrototypeProviderTemplateOffset =
       kPrototypeTemplateOffset + kPointerSize;
+  static const int kParentTemplateOffset =
+      kPrototypeProviderTemplateOffset + kPointerSize;
   static const int kNamedPropertyHandlerOffset =
       kParentTemplateOffset + kPointerSize;
   static const int kIndexedPropertyHandlerOffset =