Revert Implement sys::fs::copy_file using the macOS copyfile(3) API to support APFS clones.

This reverts r358628 (git commit 91a06bee788262a294527b815354f380d99dfa9b)
while investigating a crash reproducer bot failure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358634 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed