Ensure that promotion queue does not overlap with objects relocated to ToSpace.

src/spaces.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2122 matching lines @@
   }
 
   INLINE(Address MarkbitIndexToAddress(uint32_t index)) {
     return reinterpret_cast<Address>(index << kPointerSizeLog2);
   }
 
   // The allocation top and limit addresses.
   Address* allocation_top_address() { return &allocation_info_.top; }
   Address* allocation_limit_address() { return &allocation_info_.limit; }
 
-  MUST_USE_RESULT MaybeObject* AllocateRaw(int size_in_bytes) {
-    return AllocateRawInternal(size_in_bytes);
-  }
+  MUST_USE_RESULT INLINE(MaybeObject* AllocateRaw(int size_in_bytes));
 
   // Reset the allocation pointer to the beginning of the active semispace.
   void ResetAllocationInfo();
 
   void LowerInlineAllocationLimit(intptr_t step) {
     inline_allocation_limit_step_ = step;
     if (step == 0) {
       allocation_info_.limit = to_space_.page_high();
     } else {
       allocation_info_.limit = Min(
@@ skipping 105 matching lines @@
   // to be lower than actual limit and then will gradually increase it
   // in steps to guarantee that we do incremental marking steps even
   // when all allocation is performed from inlined generated code.
   intptr_t inline_allocation_limit_step_;
 
   Address top_on_previous_step_;
 
   HistogramInfo* allocated_histogram_;
   HistogramInfo* promoted_histogram_;
 
-  // Implementation of AllocateRaw.
-  MUST_USE_RESULT inline MaybeObject* AllocateRawInternal(int size_in_bytes);
+  MUST_USE_RESULT MaybeObject* SlowAllocateRaw(int size_in_bytes);
 
   friend class SemiSpaceIterator;
 
  public:
   TRACK_MEMORY("NewSpace")
 };
 
 
 // -----------------------------------------------------------------------------
 // Old object space (excluding map objects)
@@ skipping 326 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_