[llvm] [llvm][DebugInfo] Use formatv in GsymReader (PR #192000)

[Konrad Kleine via llvm-commits]

kwk wrote:

> LGTM, assuming conflict resolution doesn't change it significantly.

It is not significantly different but the code was reorganized and split into V1 and V2 in c3650687e0b7317b686b9187d15d2c4c63e05f8b. I'm running local tests to see if the newly pushed code works.

https://github.com/llvm/llvm-project/pull/192000