p5302: create the repo in each index-pack test

The p5302 script runs "index-pack --stdin" in each timing test. It does two things to try to get good timings: 1. we do the repo creation in a separate (non-timed) setup test, so that our timing is purely the index-pack run 2. we use a separate repo for each test; this is important because the presence of existing objects in the repo influences the result (because we'll end up doing collision checks against them) But this forgets one thing: we generally run each timed test multiple times to reduce the impact of noise. Which means that repeats of each test after the first will be subject to the collision slowdown from point 2, and we'll generally just end up taking the first time anyway. Instead, let's create the repo in the test (effectively undoing point 1). That does add a constant amount of extra work to each iteration, but it's quite small compared to the actual effects we're interested in measuring. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>