Because they make direct syscalls, and I removed some of the duplicate "64"-flavored syscalls.   All our syscalls are 64-bit by default .. we don't have `stat` and `stat64` as different syscalls.. which is what `SANITIZER_LINUX_USES_64BIT_SYSCALLS` signals.      This saves a bit of code here because we don't need `stat64_to_stat` in  this file anymore