Fix VPrintHelper used on Windows.

Fix VPrintHelper used on Windows.

VPrintHelper would silently ignore the stream given to it if application is in GUI mode (no console is attached) and redirect output to the debugger via OutputDebugString.

Such redirection makes sense only if passed stream is either stderr or stdout. Don't redirect any other stream to the debugger.

Reorder clauses in VPrintHelper to make condition more readable.

BUG=
R=yangguo@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=19688

[Vyacheslav Egorov (Chromium), 2014-02-24 19:24:25]

Please take a look. 

This fixes --redirect-code-traces on Windows when used from inside the Chrome.
Without this fix output is silently dropped to the floor unless console is
attached to it (e.g. by patching its PE header).

[Yang, 2014-02-25 15:26:29]

On 2014/02/24 19:24:25, Vyacheslav Egorov wrote:
> Please take a look. 
> 
> This fixes --redirect-code-traces on Windows when used from inside the Chrome.
> Without this fix output is silently dropped to the floor unless console is
> attached to it (e.g. by patching its PE header).

LGTM.

[Vyacheslav Egorov (Chromium), 2014-03-06 11:55:54]

Committed patchset #1 manually as r19688 (tree was closed).