Always import all tracing macros for the entire crate instead of piecemeal by module

compiler/rustc_errors/src/diagnostic_builder.rs

@@ -12,7 +12,6 @@ use std::fmt::{self, Debug};
 use std::marker::PhantomData;
 use std::ops::{Deref, DerefMut};
 use std::thread::panicking;
-use tracing::debug;
 
 /// Used for emitting structured error messages and other diagnostic information.
 ///

compiler/rustc_errors/src/emitter.rs

@@ -34,7 +34,6 @@ use std::iter;
 use std::path::Path;
 use termcolor::{Ansi, BufferWriter, ColorChoice, ColorSpec, StandardStream};
 use termcolor::{Buffer, Color, WriteColor};
-use tracing::*;
 
 /// Default column width, used in tests and when terminal dimensions cannot be determined.
 const DEFAULT_COLUMN_WIDTH: usize = 140;