[clang] [Clang] Add wraps attribute (for granular integer overflow handling) (PR #86618)

[Justin Stitt via cfe-commits]

JustinStitt wrote:

The most recent commits have massively simplified checking for the wrapping attributes.

FWIW, the tests I am running are:
✅ `$ llvm-lit clang/test/CodeGen/integer-overflow.c -v`
✅ `$ llvm-lit clang/test/CodeGen/unsigned-overflow.c -v`
✅ `$ llvm-lit clang/test/Sema/attr-wraps.c -v`
...and some hand-rolled stuff I have.


https://github.com/llvm/llvm-project/pull/86618