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

[David Spickett via llvm-commits]

https://github.com/DavidSpickett commented:

I see a bunch where `0x%<something>` becomes `0x{0:x-}` when I think it could be `{0:x+}` instead. You should pick one style and stick to it.

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