[clang] [CIR] Recognize constant aggregate initialization of auto vars (PR #166850)

[Aiden Grossman via cfe-commits]

boomanaiden154 wrote:

I've reverted this in ec21e58a30b2855e1e0140d417031281f2675a54 given it doesn't seem like a forward fix is eminent.

The premerge failures were at least partially relevant. The summary view (https://github.com/llvm/llvm-project/actions/runs/19177973584) shows `Clang.CodeGenCXX/constructors.cpp` as failing, which is what is showing up in other PRs after this patch.

Hopefully the revert isn't too disruptive. Sorry if I've made anything more difficult.

https://github.com/llvm/llvm-project/pull/166850