Remove LayoutDescriptor from Torque

LayoutDescriptor has been removed some time ago.

Change-Id: I8aa16fcd82be098c9bfd439decef8147514587d0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3260515
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77710}

src/builtins/base.tq

@@ -231,8 +231,6 @@ extern class ObjectBoilerplateDescription extends FixedArray;
 extern class ClosureFeedbackCellArray extends FixedArray;
 extern class ScriptContextTable extends FixedArray;
 
-type LayoutDescriptor extends ByteArray
-    generates 'TNode<LayoutDescriptor>';
 extern class TransitionArray extends WeakFixedArray;
 
 extern operator '.length_intptr' macro LoadAndUntagWeakFixedArrayLength(