zlib: inflate using wider loads and stores

zlib: inflate using wider loads and stores

In inflate_fast() the output pointer always has plenty of room to write.  This
means that so long as the target is capable, wide un-aligned loads and stores
can be used to transfer several bytes at once.

When the reference distance is too short simply unroll the data a little to
increase the distance.

BUG=697280
Change-Id: I59854eb25d2b1e43561c8a2afaf9175bf10cf674

[cavalcantii1, 2017-03-01 01:48:03]

The CQ bit was checked by cavalcantii@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-03-01 01:48:36]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-01 04:50:40]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-01 04:50:41]

Dry run: This issue passed the CQ dry run.

[cavalcantii1, 2017-03-28 22:10:40]

The CQ bit was checked by cavalcantii@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-03-28 22:11:08]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[cavalcantii1, 2017-03-28 22:16:21]

This optimization was upstreamed to zlib-ng at:
https://github.com/Dead2/zlib-ng/commit/71d71ad4ebdd443f9bf1ff17d0b564b5c344a237

[commit-bot: I haz the power, 2017-03-28 22:36:07]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-28 22:36:07]

Dry run: Try jobs failed on following builders:
  win_chromium_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[cavalcantii1, 2017-04-27 17:29:40]

The CQ bit was checked by cavalcantii@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-27 17:30:04]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-27 17:42:59]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-27 17:42:59]

Dry run: Try jobs failed on following builders:
  android_cronet on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_cron...)

[Simon Hosie, 2017-05-03 21:18:49]

The CQ bit was checked by simon.hosie@arm.com to run a CQ dry run

[commit-bot: I haz the power, 2017-05-03 21:19:35]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-03 23:59:03]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-05-03 23:59:03]

Dry run: This issue passed the CQ dry run.

[cblume, 2017-08-15 23:56:53]

cblume@chromium.org changed reviewers:
+ cblume@chromium.org

[cavalcantii1, 2017-08-22 18:59:27]

Rebased and moved to:
https://chromium-review.googlesource.com/627098