Remove #[macro_use] extern crate tracing from rustc_middle.

compiler/rustc_middle/src/ty/mod.rs

@@ -61,6 +61,7 @@ use rustc_span::{ExpnId, ExpnKind, Span};
 use rustc_target::abi::{Align, FieldIdx, Integer, IntegerType, VariantIdx};
 pub use rustc_target::abi::{ReprFlags, ReprOptions};
 pub use rustc_type_ir::{DebugWithInfcx, InferCtxtLike, WithInfcx};
+use tracing::{debug, instrument};
 pub use vtable::*;
 
 use std::assert_matches::assert_matches;