ImageSegment crash dumps (macos64)

Hi all,

just to inform that I experience random crash dumps when running all tests (not always but twice in 2 days).

This happens in ImageSegmentTest both with 5.3 (EncoderV3) and 6.0 (SistaV1) image, so must be unrelated to those changes.

The VM is recompiled with head revision of Cog branch