[clang] [Clang] Keep qualifiers outside of OverflowBehaviorType nodes (PR #222190)

[Justin Stitt via cfe-commits]

JustinStitt wrote:

> This probably should look more like #197624. Moving around the qualifiers on non-canonical types reduces the fidelity of the types in the AST.

ok, to summarize:
- before this pr, the strip machinery couldn't really see through the type node.
- i changed the data (losing fidelity) so the machinery doesn't have to see through the type node
- the pr you linked seems to teach the machinery how to see through the node.

I'll fix my implementation to match :)

https://github.com/llvm/llvm-project/pull/222190