ivar2: improve logging. Fix unregistering
ivar2: improve logging. Fix unregistering

Former-commit-id: dd34f00b8054b22956d9ca8d81ae7d2eeca2febf [formerly 8592c78d3b118d7fc32bd2e27423840e526735ec]
Former-commit-id: 6cd5e85926c14b1308b501e393cb3969dbf58ad6
torhve/ivar2,haste/ivar2,torhve/ivar2,torhve/ivar2