[clang] Reapply "[Clang][Sema] placement new initializes typedef array with correct size (#83124)" (PR #89036)

[via cfe-commits]

mahtohappy wrote:

Hi, the build is failing for windows but there's not test failures and no errors in the log. What should I do from here?

https://github.com/llvm/llvm-project/pull/89036