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

[Justin Stitt via cfe-commits]

JustinStitt wrote:

@bwendling we want to use `-triple` not `-target`, can you cherry pick 3ef83ad323dfbe99028c774c3716706671ba7b8b

I also reordered the tests and added labels so the tests are actually checking the right stuff -- debugging was really difficult but will be easier now.

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