The regression test test/sun/java2d/SunGraphics2D/PolyVertTest.java fails in a number
of places on all platforms/drivers when the OGL pipeline is enabled. Most of the
issues are due to the improper alignment of drawPoly() operations (these ops don't
hit pixel centers, and therefore do not match the results of our other pipelines).

(This bug is basically the same as 5051421, but I've decided to close that one since
our drawGeneralPath() no longer goes through drawPoly() as of the fix for 6322584,
and therefore PolyVertTest is a better indicator of our drawPoly() issues.)