[turbofan] Optimize JSConvertReceiver if we know something about the receiver.

src/compiler/access-builder.h

Index: src/compiler/access-builder.h
diff --git a/src/compiler/access-builder.h b/src/compiler/access-builder.h
index 05fb1099b8783f95317901014cbebb785b91dc6b..999bea6dc5c41778c91aeb9c60714f8ed28886d2 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -61,6 +61,9 @@ class AccessBuilder final : public AllStatic {
   // Provides access to String::length() field.
   static FieldAccess ForStringLength(Zone* zone);
 
+  // Provides access to GlobalObject::global_proxy() field.
+  static FieldAccess ForGlobalObjectGlobalProxy();
+
   // Provides access to GlobalObject::native_context() field.
   static FieldAccess ForGlobalObjectNativeContext();