[clang] [clang][CodeGen] Fix MSVC ABI for HVA/HFA returns with vectorcall on x86 (PR #113104)

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kin4stat wrote:

@efriedma-quic Thanks for the review! I added a release note under "ABI Changes in This Version", following the wording of similar MSVC calling convention fixes (#90547, #90151). There are no code changes since your approval.
I don't have commit access. If the release note looks fine, could you please merge this PR for me?

https://github.com/llvm/llvm-project/pull/113104