Remove all atomic access from store buffer.

src/heap/store-buffer.cc

Index: src/heap/store-buffer.cc
diff --git a/src/heap/store-buffer.cc b/src/heap/store-buffer.cc
index 37326e7e3f116b621ff02d71e77ec2f28dfaa090..4d87336bce3c7f3e24a0407075418a63145acca5 100644
--- a/src/heap/store-buffer.cc
+++ b/src/heap/store-buffer.cc
@@ -6,7 +6,6 @@
 
 #include "src/v8.h"
 
-#include "src/base/atomicops.h"
 #include "src/counters.h"
 #include "src/heap/store-buffer-inl.h"
 
@@ -434,8 +433,7 @@ void StoreBuffer::ClearInvalidStoreBufferEntries() {
     Object** slot = reinterpret_cast<Object**>(*current);
     // Use a NoBarrier_Load here since the slot can be in a dead object
     // which may be touched by the concurrent sweeper thread.

[Jarin, 2015/03/16 11:32:59]

Update (or remove?) the comment, please.

[Hannes Payer (out of office), 2015/03/16 11:55:42]

Done.

-    Object* object = reinterpret_cast<Object*>(
-        base::NoBarrier_Load(reinterpret_cast<base::AtomicWord*>(slot)));
+    Object* object = *slot;
     if (heap_->InNewSpace(object)) {
       if (heap_->mark_compact_collector()->IsSlotInLiveObject(
               reinterpret_cast<HeapObject**>(slot),