Remove #[macro_use] extern crate tracing from rustc_const_eval.

compiler/rustc_const_eval/src/util/alignment.rs

@@ -1,6 +1,7 @@
 use rustc_middle::mir::*;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_target::abi::Align;
+use tracing::debug;
 
 /// Returns `true` if this place is allowed to be less aligned
 /// than its containing struct (because it is within a packed

compiler/rustc_const_eval/src/util/caller_location.rs

@@ -5,6 +5,7 @@ use rustc_middle::query::TyCtxtAt;
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, Mutability};
 use rustc_span::symbol::Symbol;
+use tracing::trace;
 
 use crate::const_eval::{mk_eval_cx_to_read_const_val, CanAccessMutGlobal, CompileTimeEvalContext};
 use crate::interpret::*;