Fix Date DST computation.

Fix Date DST computation.

BUG=v8:3116
LOG=N
R=rossberg@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23606

[ulan, 2014-09-01 13:23:21]

ulan@chromium.org changed reviewers:
+ rossberg@chromium.org

[ulan, 2014-09-01 13:23:22]

PTAL

[rossberg, 2014-09-01 13:56:20]

LGTM

Maybe add regression test?

[ulan, 2014-09-01 14:02:55]

On 2014/09/01 13:56:20, rossberg wrote:
> LGTM
> 
> Maybe add regression test?

I thought about that, but it requires mocking DST function of OS.

[rossberg, 2014-09-01 14:39:31]

On 2014/09/01 14:02:55, ulan wrote:
> On 2014/09/01 13:56:20, rossberg wrote:
> > LGTM
> > 
> > Maybe add regression test?
> 
> I thought about that, but it requires mocking DST function of OS.

Right, well, never mind then.

[ulan, 2014-09-02 11:54:32]

Committed patchset #1 (id:1) manually as 23606 (presubmit successful).