Auto merge of #1915 - mstange:fix-intel-clipping, r=glennw
Auto merge of #1915 - mstange:fix-intel-clipping, r=glennw

Use a different workaround that fixes both #1809 and #1738.

This reverts #1810 and applies the alternative workaround that I gave in https://github.com/servo/webrender/pull/1810#issuecomment-334480233 , because this alternative workaround also happens to fix #1738.

I was hesitant to create this PR because I haven't debugged #1738 enough to understand what's going wrong. But there is probably no good reason to delay fixing this until somebody does the investigation.

r? @kvark

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