After applying r15300, I noticed a regression in svg/W3C-SVG-1.1/pservers-grad-08-b.svg: http://build.webkit.org/results/post-commit-pixel-powerpc-mac-os-x/1328/svg/W3C-SVG-1.1/pservers-grad-08-b-diffs.html Rob Buis is not seeing this on his Intel Mac, so it may be a PowerPC-only issue. It may also be an intermittent failure that just happened to occur when running tests for r15300.
It is definitely intermittent. I saw the same failure in tests after r15298, so it wasn't the patch for r15300: http://build.webkit.org/results/post-commit-pixel-powerpc-mac-os-x/1326/svg/W3C-SVG-1.1/pservers-grad-08-b-diffs.html
Created attachment 9342 [details] Expected results
Created attachment 9343 [details] Actual results
Looks like it's working again.