[clang] [Clang][Parser] Build up QualifiedTemplateName for typo correction (PR #108148)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

Given how late in the cycle it is, I would say we shouldn't backport *now* but if we do another point release of 19.x, then we should backport then.

https://github.com/llvm/llvm-project/pull/108148