[clang-tools-extra] [llvm] [clang] [Clang] Fix linker error for function multiversioning (PR #71706)

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elizabethandrews wrote:

Thank you reviews! I apologize for the delay in my response. I was OOO last week. I will apply review comments and push an update ASAP.

https://github.com/llvm/llvm-project/pull/71706