Makes FunctionTemplate::HasInstance return true for a global proxy.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 8eca750f268727784f14142db40342640ba187c1..2861bd1fb15cfa11ec541a3532b1afe19e4f5404 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -6386,7 +6386,16 @@ MaybeLocal<v8::Object> FunctionTemplate::NewRemoteInstance() {
 bool FunctionTemplate::HasInstance(v8::Local<v8::Value> value) {
   auto self = Utils::OpenHandle(this);
   auto obj = Utils::OpenHandle(*value);
-  return obj->IsJSObject() && self->IsTemplateFor(i::JSObject::cast(*obj));
+  if (obj->IsJSObject() && self->IsTemplateFor(i::JSObject::cast(*obj))) {
+    return true;
+  }
+  if (obj->IsJSGlobalProxy()) {
+    // If it's a global proxy object, then test with the global object.
+    i::PrototypeIterator iter(i::JSObject::cast(*obj)->map());
+    if (iter.IsAtEnd()) return false;
+    return self->IsTemplateFor(iter.GetCurrent<i::JSGlobalObject>());
+  }
+  return false;
 }