parser: fix build on solaris

parser: fix build on solaris

`FS` is defined in `regset.h` on solaris and smartos.

BUG=
R=ulan@chromium.org, danno@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=19602

[tfarina, 2014-02-23 22:23:25]

Copying Marja and Ulan, since Marja has been refactoring Parser and PreParser.

[ulan, 2014-02-24 06:54:57]

lgtm

[marja, 2014-02-24 08:19:42]

Thx for fixing!

[indutny, 2014-02-24 08:53:36]

On 2014/02/24 08:19:42, marja wrote:
> Thx for fixing!

Thank you!

[marja, 2014-02-24 09:06:22]

(I'll also land this as soon as V8 starts taking code in again :)

[marja, 2014-02-28 12:08:23]

Committed patchset #1 manually as r19602 (tree was closed).

[indutny, 2014-03-13 16:45:12]

On 2014/02/28 12:08:23, marja wrote:
> Committed patchset #1 manually as r19602 (tree was closed).

Thank you! Any chance it could be backported to 3.24?

[marja, 2014-03-17 10:17:13]

+yangguo,

I have no idea how merging back works, CC:ing the current sheriff, yangguo.

[Yang, 2014-03-17 12:05:36]

On 2014/03/17 10:17:13, marja wrote:
> +yangguo,
> 
> I have no idea how merging back works, CC:ing the current sheriff, yangguo.

I don't think 3.24 is even affected.

[indutny, 2014-03-17 12:12:19]

On 2014/03/17 12:05:36, Yang wrote:
> On 2014/03/17 10:17:13, marja wrote:
> > +yangguo,
> > 
> > I have no idea how merging back works, CC:ing the current sheriff, yangguo.
> 
> I don't think 3.24 is even affected.

I think it is http://v8.googlecode.com/svn/tags/3.24.40/src/parser.h ... Or is
there more up-to-date version rather than 3.24.40 ?

[Jakob Kummerow, 2014-03-17 13:50:56]

On 2014/03/17 12:12:19, indutny wrote:
> On 2014/03/17 12:05:36, Yang wrote:
> > On 2014/03/17 10:17:13, marja wrote:
> > > +yangguo,
> > > 
> > > I have no idea how merging back works, CC:ing the current sheriff,
yangguo.
> > 
> > I don't think 3.24 is even affected.
> 
> I think it is http://v8.googlecode.com/svn/tags/3.24.40/src/parser.h ... Or is
> there more up-to-date version rather than 3.24.40 ?

The 3.24 branch is based on 3.24.35. See
https://code.google.com/p/v8/source/browse/branches/3.24/src/parser.h for its
most recent version.

So I agree that no backport is necessary.