message: internal: mark some functions as constexpr
diff: namespace mesh {
  -static inline size_t PageCount(size_t sz) {
  +static inline constexpr size_t PageCount(size_t sz) {
  return (sz + (HL::CPUInfo::PageSize - 1)) / HL::CPUInfo::PageSize;
  }
  -static inline size_t RoundUpToPage(size_t sz) {
  +static inline constexpr size_t RoundUpToPage(size_t sz) {
  return HL::CPUInfo::PageSize * PageCount(sz);
  }
  