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5ca3aee00a
Some code was calling more than one of these functions in a row (in particular, FileUtil.cpp itself did it a lot...), which is a waste since it's possible to call stat a single time and then read all three values from the stat struct. This commit adds a File::FileInfo class that calls stat once on construction and then lets Exists/IsDirectory/GetSize be executed very quickly. The performance improvement mostly matters for functions that can be handling a lot of files, such as File::ScanDirectoryTree. I've also done some cleanup in code that uses these functions. For instance, some code had checks like !Exists() || !IsDirectory(), which is functionally equivalent to !IsDirectory(), and some code was using File::GetSize even though there was an IOFile object that the code could call GetSize on.