Use copy_file_range(2) to implement System.Native.CopyFile()#33159

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Commits on Apr 23, 2020

System.Native: Break SystemNative_CopyFile() into smaller functions

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System.Native: Use copy_file_range(2) on Linux to copy files

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System.Native: Cache availability of sendfile() system call

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System.Native: Refactor file metadata copying when copying files

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System.Native: Use SystemNative_Open() to handle O_CLOEXEC et al

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System.Native: Perform locking within CopyFile()

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System.Native: Update locking in SystemNative_CopyFile
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System.IO.FileSystem: Add test for File.Copy onto locked file
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Remove unnecessary double loop.
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Update the loop in CopyFile_CopyFileRange to account for file size change
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