Merge branch 'np/index-pack'

* np/index-pack:
  index-pack: don't leak leaf delta result
  improve index-pack tests
  fix multiple issues in index-pack
  index-pack: smarter memory usage during delta resolution
  index-pack: rationalize delta resolution code

diff --cc index-pack.c
Simple merge

diff --cc t/t5302-pack-index.sh
Simple merge