From: tumata <tumata.codes@gmail.com>

This commit takes care of initializing the largeFiles
with the already existing files referenced in the .gitattributes
instead of initializing with an empty set by default.

This makes it so that the 'git p4 sync' command works as
expected with git-lfs.

Signed-off-by: tumata <tumata.codes@gmail.com>

Submitted-As: https://lore.kernel.org/git/pull.1253.git.git.1650999569737.gitgitgadget@gmail.com