[llvm] [opt] Do not exit on first emitError (PR #194858)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

Why exactly do we want to change this? If this diverges from llc, why do we not want to change llc to also bail on the first error, or just keep the divergence, especially if there are passes relying on this behavior?

https://github.com/llvm/llvm-project/pull/194858