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

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+;; Make sure we can run -filter-print-funcs with -ir-dump-directory.
+; RUN: rm -rf %t/logs
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duk-37 wrote:

It's automatically generated by `-ir-dump-directory`, so I don't think so.

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