[turbofan] Lower JSLoadMessage/JSStoreMessage earlier.

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 02b88e833f1d9ff5c71b685a55578e1d67f704b9..f76aedf5a993c85d2cda2cd0645c0988033ca43a 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -26,6 +26,9 @@ class V8_EXPORT_PRIVATE AccessBuilder final
   // Provides access to a double field identified by an external reference.
   static FieldAccess ForExternalDoubleValue();
 
+  // Provides access to a tagged field identified by an external reference.
+  static FieldAccess ForExternalTaggedValue();
+
   // Provides access to an uint8 field identified by an external reference.
   static FieldAccess ForExternalUint8Value();