Enable optimizations for the Win32 debug build.

Enable optimizations for the Win32 debug build.

An equivalent change was recently done for the Macintosh and Linux
targets to eliminate the substantial lag between the execution time
of the release and debug builds.

As the /02 (Maximize Speed) flag implies the /Oy (Frame-Pointer Omission)
flag I have, in the interest of debugging, set OmitFramePointers to false.

Committed: https://code.google.com/p/dart/source/detail?r=4899

[cshapiro, 2012-03-02 02:56:50]

Hi Mads,

As we do not yet have a Win32 machine on-site, we would be greatly appreciative
if you to review this change for correctness.

Thanks!

Carl

[Mads Ager (google), 2012-03-02 09:18:42]

LGTM

I patched in the change, build and single-stepped through some code in the
debugger. All looks good. :)

[cshapiro, 2012-03-02 19:28:52]

Thanks!

[siva, 2012-03-02 19:32:16]

lgtm