[OpenJDK 2D-Dev] Please review patch for 7105461

[Clemens Eisserer]

Hi Phil,

Thanks for taking a look.

> Fix looks reasonable and good to have a fix for this!
> I do think it would be safer to be better than the X11 pipeline if possible

I reworked the original patch a bit and put the checks at a higher
level, based on the following two assumptions:
    - Clipping with the compClip will avoid coordinate overflow all the time
    - The only place where we get unclipped corrdinates is drawLine
and fillRect, all other primitives go through the DrawHandler, which
will only receive clipped segments anyway. Lines are already handled
by the last patch (OOM), so this one only focuses on fillRetc.

http://cr.openjdk.java.net/~ceisserer/7105461/webrev.01/

I also removed a synchronized which served no purpose.

Thanks, Clemens