filectx: add an overlayfilectx class
The end goal is to make it possible to avoid potential expensive fctx.data() when unnecessary. While memctx is useful for creating new file contexts, there are many cases where we could reuse an existing raw file revision (amend, histedit, rebase, process a revision constructed by a remote peer, etc). The overlayfilectx class is made to support such reuse cases. Together with a later patch, hash calculation and expensive flag processor could be avoided.
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