[llvm] [debuginfo] Create `--auto-upgrade-llvm-verify-fatal-errors` flag (PR #132115)

[Ellis Hoag via llvm-commits]

ellishg wrote:

> what's the use case for this? the other relevant flags are for faster compile times by skipping the verifier, but I'm not sure of a use case for running the verifier but ignoring if it reports an error

Unfortunately it's very common for Swift to produce IR that fails verification. I would like a mechanism to quickly turn off verification failures so I can be unblocked. Besides, with a release compiler I wouldn't expect verification to run at all, so I was surprised to see verification running here.

https://github.com/llvm/llvm-project/pull/132115