message: demo: Use meshopt_Buffer in encodeVertex to avoid memset overhead
  With SIMD decoding it's fast enough for memset overhead to offset the
  timings significantly. Of course now the timings are affected by page
  faults.
diff: @@ -560,7 +560,8 @@ void encodeVertex(const Mesh& mesh, const char* pvn)
  double middle = timestamp();
  - std::vector<PV> result(mesh.vertices.size());
  + // using meshopt_Buffer instead of std::vector to avoid memset overhead
  + meshopt_Buffer<PV> result(mesh.vertices.size());
  int res = meshopt_decodeVertexBuffer(&result[0], mesh.vertices.size(), sizeof(PV), &vbuf[0], vbuf.size());
  assert(res == 0);
  (void)res;
  @@ -576,7 +577,7 @@ void encodeVertex(const Mesh& mesh, const char* pvn)
  double(csize * 8) / double(mesh.vertices.size()),
  (middle - start) * 1000,
  (end - middle) * 1000,
  - (double(result.size() * sizeof(PV)) / (1 << 30)) / (end - middle));
  + (double(result.size * sizeof(PV)) / (1 << 30)) / (end - middle));
  }
  void stripify(const Mesh& mesh)
  