Dependencies nested in node_modules triggers an
issue with a file path used as a cache key in the
_findMissingEdges function on Windows due to
paths with mixed path separtors.

Normalize path to avoid mixed path separators on
Windows causing a cache miss for paths that refer
to the same thing. This would otherwise cause a
new node with the path of an existing node to be
created which in turns deletes the existing node
and its children. However, the children will not
be loaded again from the file system due to the
_actualTreeLoaded check in _loadFSTree.