Merge branch 'jk/escaped-wildcard-dwim'

Disambiguation logic to tell revisions and pathspec apart has been
tweaked so that backslash-escaped glob special characters do not
count in the "wildcards are pathspec" rule.

* jk/escaped-wildcard-dwim:
  verify_filename(): handle backslashes in "wildcards are pathspecs" rule

diff --cc t/t1506-rev-parse-diagnosis.sh
Simple merge