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

compiler/rustc_save_analysis/src/lib.rs

@@ -7,6 +7,9 @@
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
 
+#[macro_use]
+extern crate tracing;
+
 mod dump_visitor;
 mod dumper;
 #[macro_use]
@@ -49,8 +52,6 @@ use rls_data::{
     RefKind, Relation, RelationKind, SpanData,
 };
 
-use tracing::{debug, error, info};
-
 pub struct SaveContext<'tcx> {
     tcx: TyCtxt<'tcx>,
     maybe_typeck_results: Option<&'tcx ty::TypeckResults<'tcx>>,