[clang] [clang] fix broken canonicalization of DeducedTemplateSpecializationType (PR #95202)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:


> Or, are you saying it is too hard to get reduced?
> 
> 

I don't have a reduced test case. It's not impossible to reduce. Though we usually do a poor job of preserving TemplateNames in other places, which makes this harder to test. I have patches on my pipeline dealing with this though.

https://github.com/llvm/llvm-project/pull/95202