Merge branch 'jc/renormalize-merge-kill-safer-crlf' into maint

Fix a corner case in merge-recursive regression that crept in during 2.10 development cycle. * jc/renormalize-merge-kill-safer-crlf: convert: git cherry-pick -Xrenormalize did not work merge-recursive: handle NULL in add_cacheinfo() correctly cherry-pick: demonstrate a segmentation fault