[SYCL][Driver] Forward SYCL tool options as individual tokens

[sarnex]

Extend #22645 to apply for -Xdevice-post-link, -Xspirv-translator and -Xspirv-to-ir.

CMPLRLLVM-77053

[Copilot]

Pull request overview

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This PR updates SYCL-related option forwarding so that tool options are passed as individual tokens (via repeated --*-options= occurrences) rather than as a single space-delimited string that is re-split later in clang-linker-wrapper.

Changes:

• Forward -Xdevice-post-link, -Xspirv-translator, and -Xspirv-to-ir-wrapper options as individual tokens (no whitespace re-splitting in the linker-wrapper).
• Update LinkerWrapper::ConstructJob to emit repeated --sycl-post-link-options= / --llvm-spirv-options= / --spirv-to-ir-wrapper-options= arguments per token.
• Adjust and extend driver tests to validate multi-token forwarding behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
clang/tools/clang-linker-wrapper/ClangLinkerWrapper.cpp	Stops splitting forwarded option strings on spaces; expects tokens to arrive already separated.
clang/lib/Driver/ToolChains/Clang.cpp	Emits one wrapper option occurrence per token instead of a single joined string.
clang/test/Driver/sycl-spirv-to-ir-opt.cpp	Adds coverage for multi-token -Xspirv-to-ir-wrapper forwarding.
clang/test/Driver/sycl-spirv-opt.cpp	Adds coverage for multi-token -Xspirv-translator forwarding.
clang/test/Driver/sycl-device-post-link-opt.cpp	Adds coverage for multi-token -Xdevice-post-link forwarding.
clang/test/Driver/sycl-offload-new-driver.cpp	Updates checks to reflect per-token --sycl-post-link-options= emission.
clang/test/Driver/sycl-linker-wrapper-image.cpp	Updates direct wrapper invocation to pass repeated -sycl-post-link-options tokens.
clang/test/Driver/sycl-spirv-metadata.cpp	Updates check to match new per-token --llvm-spirv-options= behavior.

[bader]

LGTM with one suggestion for test improvement (which applies to my PR as well :)).

[mdtoguchi]

LGTM - Thanks!