Merge branch 'ps/commit-with-message-syntax-fix'

The syntax ":/<text>" to name the latest commit with the matching
text was broken with a recent change, which has been corrected.

* ps/commit-with-message-syntax-fix:
  object-name: fix reversed ordering with ":/<text>" revisions

diff --cc object-name.c
Simple merge

diff --cc t/t1500-rev-parse.sh
Simple merge