[clang] [Clang] Overflow Pattern Exclusions (PR #100272)

[Bill Wendling via cfe-commits]

bwendling wrote:

Hopefully 6e2d9df02502 fixes the buildbots. I think we should using update_cc_test_checks.py to generate these testcases though.

https://github.com/llvm/llvm-project/pull/100272