[clang] [Clang] Handle deduced auto types within AtomicType (PR #197874)

[Aaron Ballman via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm -o - %s
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AaronBallman wrote:

I've added @erichkeane and @mizvekov as reviewers for the changes to the template engine because I'm not 100% confident, but I think the changes look reasonable.

https://github.com/llvm/llvm-project/pull/197874