Further WTF::copyChars simplification

Further WTF::copyChars simplification

This patch removes the code branch handling "numCharacters == 1"
case leaving only the 'memcpy' call inside the 'WTF::copyChars'
function's body.

The reason for it is that the branch made the code more complex
giving the minor performance benefit: there was no benefit if the
'source' arg was static, otherwise the difference was just two
extra asm calls ('testq' and 'je') which should not give impact
to the real use cases performance (tested with GCC 4.6.3).

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170299

[Mikhail, 2014-03-26 15:58:31]

PTAL

[abarth-chromium, 2014-03-26 16:49:24]

lgtm

[commit-bot: I haz the power, 2014-03-26 16:49:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/213073002/1

[commit-bot: I haz the power, 2014-03-26 16:52:43]

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

[commit-bot: I haz the power, 2014-03-26 16:52:43]

Try jobs failed on following builders:
  tryserver.blink on blink_presubmit

[abarth-chromium, 2014-03-26 16:58:34]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-03-26 16:58:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/213073002/1

[commit-bot: I haz the power, 2014-03-26 17:07:45]

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

[commit-bot: I haz the power, 2014-03-26 17:07:46]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[Mikhail, 2014-03-27 09:03:27]

The CQ bit was checked by mikhail.pozdnyakov@intel.com

[commit-bot: I haz the power, 2014-03-27 09:03:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/213073002/1

[commit-bot: I haz the power, 2014-03-27 10:13:34]

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

[commit-bot: I haz the power, 2014-03-27 10:13:34]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[Mikhail, 2014-03-27 10:32:30]

The CQ bit was checked by mikhail.pozdnyakov@intel.com

[commit-bot: I haz the power, 2014-03-27 10:32:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/213073002/1

[commit-bot: I haz the power, 2014-03-27 11:50:03]

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

[commit-bot: I haz the power, 2014-03-27 11:50:04]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[Mikhail, 2014-03-27 14:10:32]

The CQ bit was checked by mikhail.pozdnyakov@intel.com

[commit-bot: I haz the power, 2014-03-27 14:10:43]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/213073002/1

[commit-bot: I haz the power, 2014-03-27 14:50:55]

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

[commit-bot: I haz the power, 2014-03-27 14:50:56]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[Mikhail, 2014-03-27 15:17:01]

The CQ bit was checked by mikhail.pozdnyakov@intel.com

[commit-bot: I haz the power, 2014-03-27 15:17:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/213073002/1

[commit-bot: I haz the power, 2014-03-27 15:36:37]

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

[commit-bot: I haz the power, 2014-03-27 15:36:38]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[Mikhail, 2014-03-28 07:49:27]

The CQ bit was checked by mikhail.pozdnyakov@intel.com

[commit-bot: I haz the power, 2014-03-28 07:49:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/213073002/1

[commit-bot: I haz the power, 2014-03-28 08:56:57]

Change committed as 170299