swap mismatched sizes
swap mismatched sizes

* surely 1KalignedHeapAllocator should use 1024,
  and 4KalignedHeapAllocator should use 4096,
  instead of the other way around

vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa