[clang] [clang][analyzer] use unqualified canonical type during merging equivalence class (PR #95729)

[Balazs Benics via cfe-commits]

https://github.com/steakhal commented:

Awesome. I have one remark though.
It would be nice to see tests that does not depend on the errno, as this eqclass merging is a major vore feature, unlike the errno modeling which is an optional feature. If have something in mind, you could add that test in addition you already propose.

Again, cool stuff!

https://github.com/llvm/llvm-project/pull/95729