Serializer: attach alignment to deferred objects.

src/snapshot/serialize.h

 // 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.
 
 #ifndef V8_SNAPSHOT_SERIALIZE_H_
 #define V8_SNAPSHOT_SERIALIZE_H_
 
 #include "src/address-map.h"
 #include "src/heap/heap.h"
 #include "src/objects.h"
@@ skipping 385 matching lines @@
   bool deserializing_user_code() { return deserializing_user_code_; }
 
   void DecodeReservation(Vector<const SerializedData::Reservation> res);
 
   bool ReserveSpace();
 
   void UnalignedCopy(Object** dest, Object** src) {
     memcpy(dest, src, sizeof(*src));
   }
 
+  void SetAlignment(byte data) {
+    DCHECK_EQ(kWordAligned, next_alignment_);
+    int alignment = data - (kAlignmentPrefix - 1);
+    DCHECK_LE(kWordAligned, alignment);
+    DCHECK_LE(alignment, kSimd128Unaligned);
+    next_alignment_ = static_cast<AllocationAlignment>(alignment);
+  }
+
   void DeserializeDeferredObjects();
 
   void FlushICacheForNewIsolate();
   void FlushICacheForNewCodeObjects();
 
   void CommitPostProcessedObjects(Isolate* isolate);
 
   // Fills in some heap data in an area from start to end (non-inclusive).  The
   // space id is used for the write barrier.  The object_address is the address
   // of the object we are writing into, or NULL if we are not writing into an
@@ skipping 391 matching lines @@
   static const int kNumCodeStubKeysOffset = kNumReservationsOffset + kInt32Size;
   static const int kPayloadLengthOffset = kNumCodeStubKeysOffset + kInt32Size;
   static const int kChecksum1Offset = kPayloadLengthOffset + kInt32Size;
   static const int kChecksum2Offset = kChecksum1Offset + kInt32Size;
   static const int kHeaderSize = kChecksum2Offset + kInt32Size;
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_SERIALIZE_H_