message: Better comment about why mov is enoug for atomic store/load
diff: @@ -3151,7 +3151,9 @@ impl Machine for MachineX86_64 {
  },
  );
  }
  - // x86_64 have a strong memory model, aligned move is guarantied to be atomic, too or from memory
  + // x86_64 have a strong memory model, so coherency between all threads (core) is garantied
  + // and aligned move is guarantied to be atomic, too or from memory
  + // so store/load an atomic is a simple mov on x86_64
  fn i32_atomic_save(
  &mut self,
  value: Location,
  