Remove some asserts to speed up debug mode.

src/heap-inl.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 341 matching lines @@
     return ((type & kIsIndirectStringMask) == kIsIndirectStringTag)
         ? OLD_POINTER_SPACE
         : OLD_DATA_SPACE;
   } else {
     return (type <= LAST_DATA_TYPE) ? OLD_DATA_SPACE : OLD_POINTER_SPACE;
   }
 }
 
 
 void Heap::CopyBlock(Address dst, Address src, int byte_size) {
-  ASSERT(IsAligned(byte_size, kPointerSize));
   CopyWords(reinterpret_cast<Object**>(dst),
             reinterpret_cast<Object**>(src),
             byte_size / kPointerSize);
 }
 
 
 void Heap::MoveBlock(Address dst, Address src, int byte_size) {
   ASSERT(IsAligned(byte_size, kPointerSize));
 
   int size_in_words = byte_size / kPointerSize;
@@ skipping 302 matching lines @@
 
 
 Heap* _inline_get_heap_() {
   return HEAP;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_