Merge branch 'js/diff-cached-fsmonitor-fix'

"git diff --cached" codepath did not fill the necessary stat
information for a file when fsmonitor knows it is clean and ended
up behaving as if it is not clean, which has been corrected.

* js/diff-cached-fsmonitor-fix:
  diff-lib: fix check_removed when fsmonitor is on

diff --cc diff-lib.c
Simple merge

diff --cc t/t7527-builtin-fsmonitor.sh
Simple merge