[clang] [Clang] add wraps and no_wraps attributes (PR #115094)

[Marco Elver via cfe-commits]

melver wrote:

> RFC regarding canonical wrapping/non-wrapping types in Clang: https://discourse.llvm.org/t/rfc-clang-canonical-wrapping-and-non-wrapping-types/84356
> 
> Ultimately, a type like what the RFC describes would supersede this PR in terms of feature completeness and usefulness. I'll close this PR if that RFC suggests a new direction is required.
> 
> pings: @erichkeane pinging you because you asked about an RFC.

+1 - I'd be in favor of the type-based approach. It does make more sense that this is a type qualifier, vs. an attribute which the compiler might loose as soon as type conversions or take-pointer operations are involved.

https://github.com/llvm/llvm-project/pull/115094