Merge branch 'jc/do-not-feed-tags-to-clear-commit-marks'

"git format-patch --ignore-if-upstream A..B" did not like to be fed
tags as boundary commits.

* jc/do-not-feed-tags-to-clear-commit-marks:
format-patch: do not feed tags to clear_commit_marks()

diff --cc builtin/log.c
Simple merge

diff --cc t/t4014-format-patch.sh
Simple merge