[clang] [Clang] Fix handling of references to variable templates with an empty argument list (PR #191154)

[Diego Baldassar via cfe-commits]

DiegoBaldassarMilleuno wrote:

@frederick-vs-ja @zyn0217 I just tested on clang 22.1.8 and the same bugs as reported by #197408 and #191016 are still present there. On 23.1.0 it's fixed. It seems that there was the intention to backport to clang 22, but it was never done AFAICT. Maybe it was forgotten? Pinging just in case.

https://github.com/llvm/llvm-project/pull/191154