largefiles: use constant for '.hglf/'
Problem: '.hglf' + '/' was computed in some tight loops. There is no need for
that.
largefiles: simplify lfdirstate ignore handling - it is only for tracking .hglf
largefiles: introduce basic debugstate --large functionality
Very useful for debugging largefiles "performance" issues.
This is used for testing
03faf12fbee7.
util: fold ENOENT check into unlinkpath, controlled by new ignoremissing flag
Refactor a common pattern.