[clang] [clang] Correct Microsoft mangling of lifetime extended temporary objects. (PR #85529)

[via cfe-commits]

https://github.com/zmodem approved this pull request.

This looks reasonable to me, but maybe give rnk and/or majnemer a day to comments as well since they're the real experts.

re: the incompatibility, yes if MSVC is mangling these now, clang should probably try to match.

https://github.com/llvm/llvm-project/pull/85529