Couple years ago while still studying for CS, I did a telephone screen (with a recruiter, not an engineer) with Microsoft and they asked me "how many lines of code have you written in your career?" (at this point I didn't have a career in SE). That was followed up by "what is the most number lines of code you've written for a single project?". Other than scanning the diffs/commits or using some reporting/metric tool, why would you care to keep count? Seems like you are focusing on the wrong data points for recruitment and software quality.