[heap] Remove heap-local variable caching FLAG_concurrent_sweeping

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1522433002

Cr-Commit-Position: refs/heads/master@{#32789}

src/heap/heap.cc

@@ -162,7 +162,6 @@ Heap::Heap()
       pending_unmapping_tasks_semaphore_(0),
       gc_callbacks_depth_(0),
       deserialization_complete_(false),
-      concurrent_sweeping_enabled_(false),
       strong_roots_list_(NULL),
       array_buffer_tracker_(NULL) {
 // Allow build-time customization of the max semispace size. Building
@@ -5004,8 +5003,6 @@ bool Heap::SetUp() {
     if (!ConfigureHeapDefault()) return false;
   }
 
-  concurrent_sweeping_enabled_ = FLAG_concurrent_sweeping;
-
   base::CallOnce(&initialize_gc_once, &InitializeGCOnce);
 
   // Set up memory allocator.

src/heap/heap.h

@@ -959,8 +959,6 @@ class Heap {
 
   void IncrementDeferredCount(v8::Isolate::UseCounterFeature feature);
 
-  bool concurrent_sweeping_enabled() { return concurrent_sweeping_enabled_; }
-
   inline bool OldGenerationAllocationLimitReached();
 
   void QueueMemoryChunkForFree(MemoryChunk* chunk);
@@ -2363,8 +2361,6 @@ class Heap {
 
   bool deserialization_complete_;
 
-  bool concurrent_sweeping_enabled_;
-
   StrongRootsList* strong_roots_list_;
 
   ArrayBufferTracker* array_buffer_tracker_;

src/heap/incremental-marking.cc

@@ -1176,7 +1176,7 @@ intptr_t IncrementalMarking::Step(intptr_t allocated_bytes,
     if (state_ == SWEEPING) {
       if (heap_->mark_compact_collector()->sweeping_in_progress() &&
           (heap_->mark_compact_collector()->IsSweepingCompleted() ||
-           !heap_->concurrent_sweeping_enabled())) {
+           !FLAG_concurrent_sweeping)) {
         heap_->mark_compact_collector()->EnsureSweepingCompleted();
       }
       if (!heap_->mark_compact_collector()->sweeping_in_progress()) {

src/heap/mark-compact.cc

@@ -561,7 +561,7 @@ void MarkCompactCollector::SweepOrWaitUntilSweepingCompleted(Page* page) {
 
 
 void MarkCompactCollector::SweepAndRefill(CompactionSpace* space) {
-  if (heap()->concurrent_sweeping_enabled() && !IsSweepingCompleted()) {
+  if (FLAG_concurrent_sweeping && !IsSweepingCompleted()) {
     SweepInParallel(heap()->paged_space(space->identity()), 0);
     space->RefillFreeList();
   }
@@ -573,13 +573,13 @@ void MarkCompactCollector::EnsureSweepingCompleted() {
 
   // If sweeping is not completed or not running at all, we try to complete it
   // here.
-  if (!heap()->concurrent_sweeping_enabled() || !IsSweepingCompleted()) {
+  if (!FLAG_concurrent_sweeping || !IsSweepingCompleted()) {
     SweepInParallel(heap()->paged_space(OLD_SPACE), 0);
     SweepInParallel(heap()->paged_space(CODE_SPACE), 0);
     SweepInParallel(heap()->paged_space(MAP_SPACE), 0);
   }
 
-  if (heap()->concurrent_sweeping_enabled()) {
+  if (FLAG_concurrent_sweeping) {
     pending_sweeper_tasks_semaphore_.Wait();
     pending_sweeper_tasks_semaphore_.Wait();
     pending_sweeper_tasks_semaphore_.Wait();
@@ -3848,7 +3848,7 @@ void MarkCompactCollector::SweepSpaces() {
       SweepSpace(heap()->map_space(), CONCURRENT_SWEEPING);
     }
     sweeping_in_progress_ = true;
-    if (heap()->concurrent_sweeping_enabled()) {
+    if (FLAG_concurrent_sweeping) {
       StartSweeperThreads();
     }
   }