[llvm] [X86] Avoid invalid ret for EH_RETURN with SHSTK (PR #219322)

[via llvm-commits]

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linisha15 wrote:

Added coverage for the Linux x86-64, Windows x86-64, and UEFI x86-64 target paths. The focused tests pass.

https://github.com/llvm/llvm-project/pull/219322