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

test/cctest/test-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 360 matching lines @@
 
 // Check that the debugger has been fully unloaded.
 void CheckDebuggerUnloaded(bool check_functions) {
   // Check that the debugger context is cleared and that there is no debug
   // information stored for the debugger.
   CHECK(CcTest::i_isolate()->debug()->debug_context().is_null());
   CHECK(!CcTest::i_isolate()->debug()->debug_info_list_);
 
   // 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());
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     CHECK(!obj->IsDebugInfo());
     CHECK(!obj->IsBreakPointInfo());
 
     // If deep check of functions is requested check that no debug break code
     // is left in all functions.
     if (check_functions) {
@@ skipping 7788 matching lines @@
       "function foo() {\n"
       "  try { throw new Error(); } catch (e) {}\n"
       "}\n"
       "debugger;\n"
       "foo();\n"
       "foo();\n");
 
   v8::Debug::SetDebugEventListener(env->GetIsolate(), nullptr);
   CHECK_EQ(break_point_hit_count, 4);
 }