Fix leveldb's alignment assumptions (we have 4 byte alignment)

lib/leveldb/util/arena.cc

@@ -36,7 +36,7 @@ char* Arena::AllocateFallback(size_t bytes) {
 }
 
 char* Arena::AllocateAligned(size_t bytes) {
-  const int align = (sizeof(void*) > 8) ? sizeof(void*) : 8;
+  const int align = 4;
   static_assert((align & (align - 1)) == 0,
                 "Pointer size should be a power of 2");
   size_t current_mod = reinterpret_cast<uintptr_t>(alloc_ptr_) & (align - 1);