Reland "Check for semaphore alignment on posix platforms. (patchset #1 id:1 of https://codereview.c…

src/heap/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/mark-compact.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/base/sys-info.h"
 #include "src/code-stubs.h"
@@ skipping 44 matching lines @@
       marking_parity_(ODD_MARKING_PARITY),
       was_marked_incrementally_(false),
       evacuation_(false),
       heap_(heap),
       marking_deque_memory_(NULL),
       marking_deque_memory_committed_(0),
       code_flusher_(nullptr),
       embedder_heap_tracer_(nullptr),
       have_code_to_deoptimize_(false),
       compacting_(false),
-      pending_compaction_tasks_semaphore_(0),
       sweeper_(heap) {
 }
 
 #ifdef VERIFY_HEAP
 class VerifyMarkingVisitor : public ObjectVisitor {
  public:
   explicit VerifyMarkingVisitor(Heap* heap) : heap_(heap) {}
 
   void VisitPointers(Object** start, Object** end) override {
     for (Object** current = start; current < end; current++) {
@@ skipping 3872 matching lines @@
     MarkBit mark_bit = Marking::MarkBitFrom(host);
     if (Marking::IsBlack(mark_bit)) {
       RelocInfo rinfo(isolate(), pc, RelocInfo::CODE_TARGET, 0, host);
       RecordRelocSlot(host, &rinfo, target);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8