convert getFileSize to RawFilePath

Lots of nice wins from this in avoiding unncessary work, and I think
nothing got slower.

This commit was sponsored by Boyd Stephen Smith Jr. on Patreon.

Remote/GitLFS.hs

@@ -389,7 +389,7 @@ mkUploadRequest rs k content = case (extractKeySha256 k, extractKeySize k) of
 		ret sha256 size
 	_ -> do
 		sha256 <- calcsha256
-		size <- liftIO $ getFileSize content
+		size <- liftIO $ getFileSize (toRawFilePath content)
 		rememberboth sha256 size
 		ret sha256 size
   where