The option was added in D90507 for C/C++ source files. This patch adds support for assembly files.
Looks good to me - thanks
Could simplify this with an early return:
if (!DwarfFormatArg) return; ...
So DwarfFormatArg isn't tested twice/reduces indentation/etc.
No need for the ? 1 : 0, that's what booleans convert to anyway. (unless there's prior art/other instances of this idiom in this file that this is consistent with)