This series, queued as 'nd/shared-index-fix', makes the 32 bit Linux
build job fail on Travis CI. Unfortunately, all it can tell us about
the failure is this:
Test Summary Report
-------------------
t1700-split-index.sh (Wstat: 256 Tests: 23
Failed: 1)
Failed test: 23
Non-zero exit status: 1
Files=809, Tests=18491, 401 wallclock secs ( 7.22 usr 1.60 sys + 263.16
cusr 49.58 csys = 321.56 CPU)
Result: FAIL
because it can't access the test's verbose log due to lack of
permissions.
https://travis-ci.org/git/git/jobs/329681826#L2074
