[clang] [clang] Emit diagnostic for typedef+auto missed case in C++98/C23 (PR #210141)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> @AaronBallman thanks for reviewing. Could you please merge this for me?

Sure can! Thank you for the poke. :-)

https://github.com/llvm/llvm-project/pull/210141