[llvm] [DebugInfo] DWARFFormValue use formatv instead of format (PR #180498)

[Konrad Kleine via llvm-commits]

kwk wrote:

> Should you use one of those `PRIx64` macros in the format string to do that automatically?

Thank you for finding that. That's correct. Let me create a PR to fix this. 

https://github.com/llvm/llvm-project/pull/180498