Reverts llvm/llvm-project#123853 The introduction of `reflect-error.ll` surfaced a bug with the use of `report_fatal_error` in `SPIRVInstructionSelector` that was propagated into the pr. This has caused a build-bot breakage, and the work to solve the underlying issue is tracked here: https://github.com/llvm/llvm-project/issues/124045. We can re-apply this commit when the underlying issue is resolved.