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

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index 24ad19be91cafbbb08d5d4720ce2611c71751f50..a3557bfb19e954b9c93ebc7f259137f59c95e78b 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -1567,6 +1567,8 @@
 
 void Logger::LogCodeObjects() {
   Heap* heap = isolate_->heap();
+  heap->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                          "Logger::LogCodeObjects");
   HeapIterator iterator(heap);
   DisallowHeapAllocation no_gc;
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
@@ -1648,6 +1650,8 @@
 
 void Logger::LogCompiledFunctions() {
   Heap* heap = isolate_->heap();
+  heap->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                          "Logger::LogCompiledFunctions");
   HandleScope scope(isolate_);
   const int compiled_funcs_count = EnumerateCompiledFunctions(heap, NULL, NULL);
   ScopedVector< Handle<SharedFunctionInfo> > sfis(compiled_funcs_count);
@@ -1666,6 +1670,8 @@
 
 void Logger::LogAccessorCallbacks() {
   Heap* heap = isolate_->heap();
+  heap->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                          "Logger::LogAccessorCallbacks");
   HeapIterator iterator(heap);
   DisallowHeapAllocation no_gc;
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {