Revert #133817 This reverts commit 0585134e709de4a14e509158662fa569c155c195, reversing changes made to 5530869e0ff21d69e0eef1a4c4fd1f25bcbe7fbf. #133817 unfortunately only converted the `println!` instances to `eprintln!`, meaning that some test output (via compiletest/bootstrap) was messed up because stdout/stderr output interleaved improperly when some `println!` instances were converted to `eprintln!` instances, while some `print!` instances remain unchanged. This made reading test output annoying for contributors cc #133879. Closes #133879 by reverting. #133817 can be relanded in the future when `print!` instances are also matched with `println!` instances. cc `@clubby789` This is a clean revert so I'm going to self-approve this PR.