[llvm] [llvm][Support] Create llvm::formatv variant of llvm::createStringError (PR #176407)

[Jakub Kuderski via llvm-commits]

kuhar wrote:

@Michael137 maybe move this to a new header `llvm/include/llvm/Support/ErrorExtras.h`?

https://github.com/llvm/llvm-project/pull/176407