Merge branch 'ds/line-log-on-bloom'

Merge branch 'ds/line-log-on-bloom'

"git log -L..." now takes advantage of the "which paths are touched
by this commit?" info stored in the commit-graph system.

* ds/line-log-on-bloom:
  line-log: integrate with changed-path Bloom filters
  line-log: try to use generation number-based topo-ordering
  line-log: more responsive, incremental 'git log -L'
  t4211-line-log: add tests for parent oids
  line-log: remove unused fields from 'struct line_log_data'