[clang] [clang] Assertion failure on template parameter deduction failure (PR #213166)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

Possibly labeled nfc? I'm not convinced assertion fixes warrant a release note, and this doesn't seem to cause any problems in non-assertion builds: the error case reports an error and does not compile, the non-error producing cases are also accepted by gcc, and the codegen looks correct?

https://github.com/llvm/llvm-project/pull/213166