[heap] Do not invoke GC to make heap iterable.

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
diff --git a/test/cctest/test-debug.cc b/test/cctest/test-debug.cc
index cfe63f216d599a5231f3332e786d599f9cc0cd91..7254efa6557658b30668c8ae5786ec949c532704 100644
--- a/test/cctest/test-debug.cc
+++ b/test/cctest/test-debug.cc
@@ -378,7 +378,7 @@ void CheckDebuggerUnloaded(bool check_functions) {
 
   // Collect garbage to ensure weak handles are cleared.
   CcTest::heap()->CollectAllGarbage();
-  CcTest::heap()->CollectAllGarbage(Heap::kMakeHeapIterableMask);
+  CcTest::heap()->CollectAllGarbage();
 
   // Iterate the head and check that there are no debugger related objects left.
   HeapIterator iterator(CcTest::heap());