[llvm] [MC] Fix DWARF file table for files with empty DWARF (#119020) (PR #119229)

[Aleksei Vetrov via llvm-commits]

noxwell wrote:

I've noticed that `MasmParser.cpp` is a copypaste of `AsmParser.cpp` and it has the same bug. Is it worth to copy the fix there also? Where are the tests for it, is it `llvm/test/tools/llvm-ml`? And it looks like `MasmParser.cpp` doesn't have any test coverage related to DWARF information...

https://github.com/llvm/llvm-project/pull/119229