shader-slang / slang-rhi / 20224334903

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Fix ray tracing test compilation with ToT slang (#605)

Disable some code that is failing to compile against Slang ToT.

Specifically, ifdef out Slang code that calls ObjectRayOrigin and
ObjectRayDirection from closest hit programs. Slang correctly rejects
this when targeting CUDA/OptiX, since OptiX disallows those intrinsics
in closest hit.

Also disable D3D12 code that calls MakeMotionHit and TraceMotionRay.
It's unclear if these are failing due to bugs in Slang, but we don't
test them anyway (slang-rhi doesn't support motion blur for D3D12 yet).

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