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Summary: This patch implements `formatv()` formatting for `dwarf::LineNumberOps` and makes use of it for the `llvm-dwarfdump --debug-line` dump. Previously, unknown line number standard opcodes would lead to undefined behaviour. The code would attempt to format the data pointer of an empty `StringRef` (a null pointer) using `%s`. According to the description for `format()`, use of that interface carries the "risk of `printf`". Passing a null pointer in place of an array to a C library function results in undefined behaviour. Reviewers: jhenderson, daltenty, stevewan Reviewed By: jhenderson Subscribers: aprantl, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D72369