Revert of Version 4.5.103.23 (cherry-pick)

src/heap/incremental-marking.cc

Index: src/heap/incremental-marking.cc
diff --git a/src/heap/incremental-marking.cc b/src/heap/incremental-marking.cc
index 58eb0aa4097af88afb2bf7ba684efcb836e3b2d4..22051eaab2d5793681dbd6ba3df3ccfd1495dfec 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -16,34 +16,22 @@ namespace v8 {
 namespace internal {
 
 
-IncrementalMarking::StepActions IncrementalMarking::IdleStepActions() {
-  return StepActions(IncrementalMarking::NO_GC_VIA_STACK_GUARD,
-                     IncrementalMarking::FORCE_MARKING,
-                     IncrementalMarking::DO_NOT_FORCE_COMPLETION);
-}
-
-
 IncrementalMarking::IncrementalMarking(Heap* heap)
     : heap_(heap),
       state_(STOPPED),
-      is_compacting_(false),
       steps_count_(0),
       old_generation_space_available_at_start_of_incremental_(0),
       old_generation_space_used_at_start_of_incremental_(0),
-      bytes_rescanned_(0),
       should_hurry_(false),
       marking_speed_(0),
-      bytes_scanned_(0),
       allocated_(0),
-      write_barriers_invoked_since_last_step_(0),
       idle_marking_delay_counter_(0),
       no_marking_scope_depth_(0),
       unscanned_bytes_of_large_object_(0),
       was_activated_(false),
       weak_closure_was_overapproximated_(false),
       weak_closure_approximation_rounds_(0),
-      request_type_(COMPLETE_MARKING),
-      gc_callback_flags_(kNoGCCallbackFlags) {}
+      request_type_(COMPLETE_MARKING) {}
 
 
 void IncrementalMarking::RecordWriteSlow(HeapObject* obj, Object** slot,
@@ -484,12 +472,9 @@ static void PatchIncrementalMarkingRecordWriteStubs(
 }
 
 
-void IncrementalMarking::Start(int mark_compact_flags,
-                               const GCCallbackFlags gc_callback_flags,
-                               const char* reason) {
+void IncrementalMarking::Start(int mark_compact_flags) {
   if (FLAG_trace_incremental_marking) {
-    PrintF("[IncrementalMarking] Start (%s)\n",
-           (reason == nullptr) ? "unknown reason" : reason);
+    PrintF("[IncrementalMarking] Start\n");
   }
   DCHECK(FLAG_incremental_marking);
   DCHECK(FLAG_incremental_marking_steps);
@@ -499,7 +484,6 @@ void IncrementalMarking::Start(int mark_compact_flags,
 
   ResetStepCounters();
 
-  gc_callback_flags_ = gc_callback_flags;
   was_activated_ = true;
 
   if (!heap_->mark_compact_collector()->sweeping_in_progress()) {
@@ -842,7 +826,7 @@ void IncrementalMarking::Epilogue() {
 
 void IncrementalMarking::OldSpaceStep(intptr_t allocated) {
   if (IsStopped() && ShouldActivateEvenWithoutIdleNotification()) {
-    Start(Heap::kNoGCFlags, kNoGCCallbackFlags, "old space step");
+    Start(Heap::kNoGCFlags);
   } else {
     Step(allocated * kFastMarking / kInitialMarkingSpeed, GC_VIA_STACK_GUARD);
   }