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The goal of this PR is to fix the issue when use of token type in LLVM intrinsic causes undefined behavior of SPIR-V Backend code generator when assertions are disabled: https://github.com/llvm/llvm-project/issues/78434 Among possible fix options, discussed in the https://github.com/llvm/llvm-project/issues/78434 issue description, the option to generate a meaningful error before execution arrives at the `llvm_unreachable` call looks like a better solution for now, because SPIR-V doesn't support token type anyway without additional extensions. The PR is to generate a user-friendly error message and exit without generating a stack dump when such a usage of token type was detected that would lead to undefined behavior of SPIR-V Backend code generator.