Render: disable Z pass by default, leave only Combined

It was somewhat arbitrary to have this one pass enabled that adds a bit of
additional memory and render time overhead, even though it's not necessarily
more important than others.

Render: remove unused Blender Internal view layer settings

These should have been removed earlier but were forgotten.

Fix T90295: inconsistent render pass order between Cycles and Eevee

Cycles X: restore CPU sampling profiler

Stats now reflect the new kernels. Also change implementation to unset active
shader and object, previously there were some hard to verify assumptions about
for which kernels we can assume they are correctly set.

Differential Revision: https://developer.blender.org/D12042

Cycles X: fix/improve handling of mismatches between render pass components

Rules are as follows now:
* Single channel pass: can be read into buffer with 1, 3 or 4 channels
* Motion and cryptomatte passes: must be read into buffer with 4 channels
* RGB, RGBA and vector passes: can be read into buffer with 3 or 4 channels

Differential Revision: https://developer.blender.org/D12063

Merge branch 'master' into cycles-x

Cycles: remove WITH_CYCLES_DEBUG, add WITH_CYCLES_DEBUG_NAN

WITH_CYCLES_DEBUG was used for rendering BVH debugging passes. But since we
mainly use Embree an OptiX now, this information is no longer important.

WITH_CYCLES_DEBUG_NAN will enable additional checks for NaNs and invalid values
in the kernel, for Cycles developers. Previously these asserts where enabled in
all debug builds, but this is too likely to crash Blender in scenes that render
fine regardless of the NaNs. So this is behind a CMake option now.

Fixes T90240

Fix Cycles X wrong OptiX denoising with normal pass

Cleanup: compiler warning

Fix LLVM 12 symbol conflict with Mesa drivers, after recent Linux libs update