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llvmpipe tessellation shader

Dave Airlie requested to merge airlied/mesa:llvmpipe-tessellation-shader into master

This adds support for ARB_tessellation_shader to llvmpipe, using the Microsoft tessellator that the swr team are using.

The patches may need some more reordering/splitting, not sure, it's kinda messy to rework.

This is only NIR + LLVM support, no TGSI/softpipe support is planned.

It passes most of the piglits (2 or 3 fails), and quite a few of dEQP GLES 3.1 tests.

It renders the heaven demo properly.

Edited by Dave Airlie

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