Update 4-at-a-time APIs.

Update 4-at-a-time APIs.

There is no reason to require the 4 SkPMFloats (registers) to be adjacent.
The only potential win in loads and stores comes from the SkPMColors being adjacent.

Makes no difference to existing bench.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/15391ee4acaa092f52742f64968ad8046b74ca81

[mtklein_C, 2015-03-24 21:42:37]

mtklein@chromium.org changed reviewers:
+ reed@google.com

[mtklein_C, 2015-03-24 21:42:40]

The CQ bit was checked by mtklein@chromium.org

[commit-bot: I haz the power, 2015-03-24 21:42:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1035583002/40001

[commit-bot: I haz the power, 2015-03-24 21:42:55]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-03-25 03:42 UTC

[commit-bot: I haz the power, 2015-03-24 21:49:03]

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

[commit-bot: I haz the power, 2015-03-24 21:49:04]

Try jobs failed on following builders:
  Build-Ubuntu-Clang-x86_64-Debug-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-Clang-x...)

[mtklein, 2015-03-24 22:30:00]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-03-24 22:30:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1035583002/40001

[commit-bot: I haz the power, 2015-03-24 22:30:19]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-03-25 04:30 UTC

[commit-bot: I haz the power, 2015-03-25 04:30:21]

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

[commit-bot: I haz the power, 2015-03-25 04:30:22]

No LGTM from a valid reviewer yet. Please ask for an LGTM from a
full Skia committer from
https://skia.googlesource.com/skia/+/master/CQ_COMMITTERS

[reed1, 2015-03-25 20:20:45]

lgtm

[mtklein, 2015-03-25 20:23:22]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-03-25 20:23:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1035583002/40001

[commit-bot: I haz the power, 2015-03-25 20:23:43]

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

[commit-bot: I haz the power, 2015-03-25 20:23:44]

Presubmit check for 1035583002-40001 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
bench/PMFloatBench.cpp is missing a correct copyright header.

src/core/SkPMFloat.h is missing a correct copyright header.

src/opts/SkPMFloat_SSE2.h is missing a correct copyright header.

src/opts/SkPMFloat_SSSE3.h is missing a correct copyright header.

src/opts/SkPMFloat_neon.h is missing a correct copyright header.

src/opts/SkPMFloat_none.h is missing a correct copyright header.

tests/PMFloatTest.cpp is missing a correct copyright header.

[mtklein, 2015-03-25 20:26:43]

The CQ bit was checked by mtklein@google.com

[mtklein, 2015-03-25 20:26:44]

The patchset sent to the CQ was uploaded after l-g-t-m from reed@google.com
Link to the patchset: https://codereview.chromium.org/1035583002/#ps60001
(title: "(C)")

[commit-bot: I haz the power, 2015-03-25 20:27:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1035583002/60001

[commit-bot: I haz the power, 2015-03-25 20:43:37]

Committed patchset #4 (id:60001) as
https://skia.googlesource.com/skia/+/15391ee4acaa092f52742f64968ad8046b74ca81