[PATCH 0/9] misc commit-graph and oid-array cleanups

This series came out of an off-list discussion about using oid-array in commit-graph.c to replace a similar data structure. But I found a couple of things to clean up along the way.

Surprisingly, this doesn't conflict with Stolee's "chunk-format API" series from yesterday. Nor any of the other commit-graph work in "seen".

  [1/9]: oid-array.h: drop sha1 mention from header guard
  [2/9]: t0064: drop sha1 mention from filename
  [3/9]: t0064: make duplicate tests more robust
  [4/9]: cache.h: move hash/oid functions to hash.h
  [5/9]: oid-array: make sort function public
  [6/9]: oid-array: provide a for-loop iterator
  [7/9]: commit-graph: drop count_distinct_commits() function
  [8/9]: commit-graph: replace packed_oid_list with oid_array
  [9/9]: commit-graph: use size_t for array allocation and indexing

 cache.h                                       |  94 ---------------
 commit-graph.c                                | 107 +++---------------
 hash.h                                        |  95 ++++++++++++++++
 oid-array.c                                   |  17 ++-
 oid-array.h                                   |  33 +++++-
 t/{t0064-sha1-array.sh => t0064-oid-array.sh} |   9 +-
 6 files changed, 156 insertions(+), 199 deletions(-)
 rename t/{t0064-sha1-array.sh => t0064-oid-array.sh} (90%)

-Peff