[clang-sycl-linker] Improve --spirv-dump-device-code and harden CLI handling (#200096) Several small fixes and improvements to `clang-sycl-linker`'s command-line handling, plus completing the `--spirv-dump-device-code` option: - **`--version`**: now exits with `EXIT_SUCCESS` after printing, instead of falling through into the rest of `main`. - **Empty input**: report a clear "No input files provided" error from `getInput` rather than triggering an assertion deep inside `linkDeviceCode`. - **`--spirv-dump-device-code`**: previously parsed but ignored — now actually copies each generated `.spv` file into the requested directory. The directory is created up-front (`mkdir -p` semantics) so a missing path produces a friendly diagnostic instead of a low-level copy errno. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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