[clang] [Clang] [Sema] Use getCurFunctionDecl() to get the current function (PR #211938)

[via cfe-commits]

llvmbot wrote:

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Failed to cherry-pick: a891a5c

https://github.com/llvm/llvm-project/actions/runs/30278832502

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/211938