[llvm] [StandardInstrumentations] Ensure non-null module pointer when getting display name for IR file (PR #110779)

[via llvm-commits]

duk-37 wrote:

FYI I don't have commit access for the time being, so if this looks good it'd be great if you could merge it in @aeubanks :)

https://github.com/llvm/llvm-project/pull/110779