[clang] Qualify non-dependent types of a class template with the class declar… (PR #67566)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

CC @vgvassilev @pcanal @Sterling-Augustine 
As the removed workaround dates back to the initial implementation imported in 0dd191a5c4bf27cc8a2b6033436b00f0cbdc4ce7 from Cling.

https://github.com/llvm/llvm-project/pull/67566