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

[Paul Kirth via cfe-commits]

ilovepi wrote:

I'm seeing some failures after this patch in our CI: https://ci.chromium.org/ui/p/fuchsia/builders/toolchain.ci/clang-host-linux-x64/b8698832590638838641/overview

I'm also seeing this in premerge on another patch https://github.com/llvm/llvm-project/pull/166995 and confirmed I see this locally on main. Can you take a look or revert if the fix isn't obvious?

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