Fix MinGW-w64 GCC 4.7 compilation

Fix MinGW-w64 GCC 4.7 compilation

Contributed by net147@gmail.com

BUGS=
TEST=

Committed: https://code.google.com/p/v8/source/detail?r=11357

[Yang, 2012-04-17 13:34:55]

On 2012/04/08 13:41:27, Net147 wrote:

LGTM, landing.

[Yang, 2012-04-17 13:37:19]

Just noticed something. I will land this patch after this question has been
cleared.

https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
File test/cctest/test-disasm-x64.cc (right):

https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
test/cctest/test-disasm-x64.cc:267: (void) after_break_target;
What is this for?

[Net147, 2012-04-17 14:25:01]

https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
File test/cctest/test-disasm-x64.cc (right):

https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
test/cctest/test-disasm-x64.cc:267: (void) after_break_target;
On 2012/04/17 13:37:19, Yang wrote:
> What is this for?

I get a compiler error because it thinks this variable is never used.

[Yang, 2012-04-17 14:32:43]

On 2012/04/17 14:25:01, Net147 wrote:
>
https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
> File test/cctest/test-disasm-x64.cc (right):
> 
>
https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
> test/cctest/test-disasm-x64.cc:267: (void) after_break_target;
> On 2012/04/17 13:37:19, Yang wrote:
> > What is this for?
> 
> I get a compiler error because it thinks this variable is never used.

Unfortunately, this sort of cast violates the Google code style:
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Casting

Maybe you can take advantage of the USE(x) template in globals.h?

[Net147, 2012-04-17 14:38:09]

On 2012/04/17 14:32:43, Yang wrote:
> On 2012/04/17 14:25:01, Net147 wrote:
> >
>
https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
> > File test/cctest/test-disasm-x64.cc (right):
> > 
> >
>
https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
> > test/cctest/test-disasm-x64.cc:267: (void) after_break_target;
> > On 2012/04/17 13:37:19, Yang wrote:
> > > What is this for?
> > 
> > I get a compiler error because it thinks this variable is never used.
> 
> Unfortunately, this sort of cast violates the Google code style:
> http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Casting
> 
> Maybe you can take advantage of the USE(x) template in globals.h?

Updated.

[Yang, 2012-04-17 15:04:40]

On 2012/04/17 14:38:09, Net147 wrote:
> On 2012/04/17 14:32:43, Yang wrote:
> > On 2012/04/17 14:25:01, Net147 wrote:
> > >
> >
>
https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
> > > File test/cctest/test-disasm-x64.cc (right):
> > > 
> > >
> >
>
https://chromiumcodereview.appspot.com/10019012/diff/6003/test/cctest/test-di...
> > > test/cctest/test-disasm-x64.cc:267: (void) after_break_target;
> > > On 2012/04/17 13:37:19, Yang wrote:
> > > > What is this for?
> > > 
> > > I get a compiler error because it thinks this variable is never used.
> > 
> > Unfortunately, this sort of cast violates the Google code style:
> > http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Casting
> > 
> > Maybe you can take advantage of the USE(x) template in globals.h?
> 
> Updated.

Landed as r11357.