[clang] [clang] Skip auto-init on scalar vars that have a non-constant Init and no self-ref (PR #94642)

[Ilya Biryukov via cfe-commits]

https://github.com/ilya-biryukov commented:

Looks from the C++ language rules and compiler frontend perspective.
The logic behinds the checks seems solid, there should not be any uncaught reads.

I am still unsure if we are doing the right thing for Objective C's `-fblocks`, left a comment asking about it.

https://github.com/llvm/llvm-project/pull/94642