reformat hard-to-read preprocessor in SkJumper.cpp

Change-Id: I9a140e342e7b12b1cbb09503ca8fc03016717784
Reviewed-on: https://skia-review.googlesource.com/55701
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed