LibJS: Assert if garbage collection is restarted while ongoing

We can't GC while we're already in GC. Assert if this happens.

1 files changed, 2 insertions, 0 deletions

diff --git a/Libraries/LibJS/Heap/Heap.h b/Libraries/LibJS/Heap/Heap.h
index b1381a8dae..0d727210a4 100644
--- a/Libraries/LibJS/Heap/Heap.h
+++ b/Libraries/LibJS/Heap/Heap.h
@@ -109,6 +109,8 @@ private:
 
     size_t m_gc_deferrals { 0 };
     bool m_should_gc_when_deferral_ends { false };
+
+    bool m_collecting_garbage { false };
 };
 
 }