Blender Git Loki

Fix T43027: OpenCL kernel compilation broken after QBVH

OpenCL apparently does not support templates, so the idea of generic
function for swapping is a bit of a failure. Now it is either inlined
into the code (in triangle intersection) or has specific implementation
for QBVH.

This is probably even better, because we can't create QBVH-specific
function in util_math anyway.