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

[Balazs Benics via cfe-commits]

https://github.com/steakhal approved this pull request.

Excellent quality. Thank for fixing this.
Do you need us to merge this, or you have merge rights?

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