Add support for writing the BIDX and BDAT chunks of the commit graph
file, as described in man gitformat-commit-graph(5). The ability to read
such chunks will be added in a subsequent commit.
This work is based on earlier work by Kyle Zhao
(Ib863782af209f26381e3ca0a2c119b99e84b679c).
Change-Id: Ic18e6f0eeec7da1e1ff31751aabda5e6952dbe6e
Signed-off-by: kylezhao <kylezhao@tencent.com>
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
49beb5ae51