[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 440c6f15c490254016b5789fda65c6b508ceb19a..73a3909591348d79c8d2653da22fb244234b3c2b 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());