[Bf-cycles] Volumetric patch update

[storm]

No big changes, just rebased to latest trunk. Have few segfaults when
trying to render very old test scenes, i suspect it related to changes
to nodes system, maybe unrelated. As AMD OpenCL compiler misery
continues, dont expect big changes in near future in patch as well.

Warning, do NOT save your important files with patched Blender,
especially if any "Volume BSDF" material node present. If you absolutely
need that, try to remove before save and add it later every time scene
opened by hands.


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