Optix simplification / cleanup #1011
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Description
Trying to simplify / cleanup portions of the current implementation.
Make OSL::pvt::gSplineData constant which can avoid avoid CPU->GPU upload.
Introduce BackendLLVM::llvm_load_string to localize the branching done when uploading strings.
Send actual bitcode bytes vs a point to std::vector (which is currently incurring a temporary allocation penalty)