Merge branch 'jk/fully-peeled-packed-ref' into maint-1.8.1

* jk/fully-peeled-packed-ref:
  pack-refs: add fully-peeled trait
  pack-refs: write peeled entry for non-tags
  use parse_object_or_die instead of die("bad object")
  avoid segfaults on parse_object failure

diff --cc builtin/grep.c
Simple merge

diff --cc builtin/prune.c
Simple merge

diff --cc bundle.c
Simple merge

diff --cc refs.c
Simple merge