LibJS: Simplify Heap::mark_live_cells()

Instead of iterating over every single cell, simply iterate over the
live cells and mark them from there.

Thanks to Blam for suggesting this! :^)

1 files changed, 3 insertions, 7 deletions

diff --git a/Libraries/LibJS/Heap.cpp b/Libraries/LibJS/Heap.cpp
index 035cf9dc3a..33ce668c54 100644
--- a/Libraries/LibJS/Heap.cpp
+++ b/Libraries/LibJS/Heap.cpp
@@ -118,15 +118,11 @@ void Heap::mark_live_cells(const HashTable<Cell*>& live_cells)
 #ifdef HEAP_DEBUG
     dbg() << "mark_live_cells:";
 #endif
-    for (auto& block : m_blocks) {
-        block->for_each_cell([&](Cell* cell) {
-            if (live_cells.contains(cell)) {
+    for (auto& cell : live_cells) {
 #ifdef HEAP_DEBUG
-                dbg() << "  ! " << cell;
+        dbg() << "  ! " << cell;
 #endif
-                cell->set_marked(true);
-            }
-        });
+        cell->set_marked(true);
     }
 }