Fix new shadow catcher not handling emissive meshes correctly

These must also be excluded from direct light sampling for the shadow
catcher pass.

Cycles X: refactoring of kernel globals

* Declare kernel globals and associated macros in one place
* Add IntegratorStateGPU for CPU host to access
* Reduce code duplication between CUDA and OptiX
* Make shader sort key part of integrator state template
* Remove unused CPU kernel globals
* Prepare for copying/moving states
* Rename integrator_path_state.h to integrator_state_flow.h, to avoid
confusion with kernel_path_state.h.

Part of these changes were implemented by Sergey for D11172.

Differential Revision: https://developer.blender.org/D11185

Cleanup: make ShaderType a template parameter for SVM nodes

Fix T87982: crash switching render slots while render is in progress

Fix T88001: persistent data render wrong when changing camera border

Fix T85287: Cycles deadlock loading Blender images in some cases

Fix errors in Cycles comments

Cycles X: tune kernel parameters for RTX cards

As the kernel keeps changing the optimal values will change as well, so this
will need to be revisited when more work is done. And every kernel probably
has a different optimal value. But this is an easy step in the right direction.

Differential Revision: https://developer.blender.org/D11160

Fix Cycles X crash using a BSDF in a light shader

* Move BSDF feature test so the right offset is applied
* Exclude BSDFs from volume shaders, and volumes from surface shaders,
to prevent a similar issues.

It would be most efficient to exclude BSDFs entirely from light shaders, but
this is difficult since Cycles does not make a distinction. A shader can be used
by both a Mesh and Light and is compiled only once. We do make a distinction
between surface/volume/displacement shaders, so for that case we can ignore
the node during shader compilation.

Differential Revision: https://developer.blender.org/D11164

Cycles: don't copy object matrices for objects without motion blur

To avoid memory read/write cost on the GPU.

Differential Revision: https://developer.blender.org/D11132