tree 1e113ac03da6f9a7ed380beadd922ee4430b7810
parent 33f6b2690a0a9d34a0725c943318315a024fa758
author Ivan Frade <ifrade@google.com> 1557427901 -0700
committer Ivan Frade <ifrade@google.com> 1574721816 -0800

VisibilityCache: Use jgit's ReachabilityChecker

The current reachability check is not using bitmaps when they are
available.

Replace the local walk with a ReachabilityChecker, and choose the
implementation depending on whether the repository has bitmaps.

Change-Id: I6a822d129b64a1bd002aba343e4b1ce3b7f3fd2e