Revert "store_dw_loop: make loops smaller"

Revert "store_dw_loop: make loops smaller"

This reverts commit f00efff326610fdba92dbc91d951790a3320052e.

This is a temporary revert since I want QA to first test with the
original testcase whether it got faster again. This is to test the
effects of

commit 227f782e4667fc622810bce8be8ccdeee45f89c2
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu May 15 10:41:42 2014 +0100

    drm/i915: Retire requests before creating a new one

We should revert this revert again as soon as QA has completed
testing.

References: https://bugs.freedesktop.org/show_bug.cgi?id=78024
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>