[clang] [Clang][CodeGen] Emit “trap reasons” on UBSan traps (PR #145967)

[Dan Liew via cfe-commits]

delcypher wrote:

> What is debug info size impact?

We'll ask @anthonyhatran to run some experiments on a few open source projects (if you have any that you interested in then particular please let us know).

I wonder how much this will matter in practice though because (at least for Apple platforms) debug info is not part of the final binary and is instead stored elsewhere (apart from static libraries where debug is stored inside the object files). So in a deployment scenario the executable or dynamic library size is unchanged, no matter how big the debug info gets.

https://github.com/llvm/llvm-project/pull/145967