[clang] [clang-tools-extra] [RecursiveASTVisitor] Assert we skip implicit instantiations. (PR #110899)

[Harald van Dijk via cfe-commits]

hvdijk wrote:

Thanks, merged! And I'm still bisecting to figure out exactly when it was fixed, I'll update and close the issue that this was originally about when I find it.

https://github.com/llvm/llvm-project/pull/110899