Atomic ARC

[matkuki]

Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz (Windows 10 x64):

`koch.exe boot -d:release --threads:on --mm:arc`:

  * iteration 1: 20.404s; 489.047MiB peakmem;
  * iteration 2: 15.703s; 489.32MiB peakmem;
  * iteration 3: 14.948s; 489.32MiB peakmem;



`koch.exe boot -d:release --threads:on --mm:atomicArc`:

  * iteration 1: 16.322s; 489.016MiB peakmem;
  * iteration 2: 16.330s; 489.082MiB peakmem;
  * iteration 3: 16.035s; 489.082MiB peakmem;