Respect double alignment in Mark-compact collector.

src/heap/heap.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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 1921 matching lines @@
   return new_space_front;
 }
 
 
 STATIC_ASSERT((FixedDoubleArray::kHeaderSize & kDoubleAlignmentMask) ==
               0);  // NOLINT
 STATIC_ASSERT((ConstantPoolArray::kFirstEntryOffset & kDoubleAlignmentMask) ==
               0);  // NOLINT
 STATIC_ASSERT((ConstantPoolArray::kExtendedFirstOffset &
                kDoubleAlignmentMask) == 0);  // NOLINT
+STATIC_ASSERT((FixedTypedArrayBase::kDataOffset & kDoubleAlignmentMask) ==
+              0);  // NOLINT
 
 
 HeapObject* Heap::EnsureDoubleAligned(HeapObject* object, int size) {
   if ((OffsetFrom(object->address()) & kDoubleAlignmentMask) != 0) {
     CreateFillerObjectAt(object->address(), kPointerSize);
     return HeapObject::FromAddress(object->address() + kPointerSize);
   } else {
     CreateFillerObjectAt(object->address() + size - kPointerSize, kPointerSize);
     return object;
   }
@@ skipping 4517 matching lines @@
       }
       delete list;
     } else {
       prev = list;
     }
     list = next;
   }
 }
 }
 }  // namespace v8::internal