Andrew Gallant 7b73fde972 Stop storing the underlying fs::DirEntry.
An fs::DirEntry is in fact quite large---over 256 bytes. This results in
a lot of time spent memmoving it around.

This does result in a small performance regression on Windows for callers
that ask for the `metadata` of a directory entry.
2016-09-16 17:54:43 -04:00
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