Revert "[classes] Make sure parent classes are never turned to setup mode"

This reverts commit 0ce0d934.

Reason for revert: Causes failures on GC stress bots.

Original change's description:
> [classes] Make sure parent classes are never turned to setup mode
>
> It doesn't make sense in general and moreover an attempt to do so might
> cause hard stack overflow.
>
> Bug: v8:11317
> Change-Id: I2a6bbadba1ebc5c1496660c734df76a13600edac
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643389
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72275}

TBR=ishell@chromium.org,verwaest@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

No-Tree-Checks: true
Bug: v8:11317
Change-Id: I524ce6dfee219180f36302edc94b8935c91f21dd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2642458
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72280}

src/runtime/runtime-classes.cc

@@ -559,8 +559,6 @@ bool InitClassConstructor(
     // Set map's prototype without enabling prototype setup mode for superclass
     // because it does not make sense.
     Map::SetPrototype(isolate, map, constructor_parent, false);
-    // Ensure that setup mode will never be enabled for superclass.
-    JSObject::MakePrototypesFast(constructor_parent, kStartAtReceiver, isolate);
   }
 
   Handle<NumberDictionary> elements_dictionary_template(