Add tracing level for codegen_mir

compiler/rustc_codegen_ssa/src/mir/mod.rs

@@ -129,6 +129,7 @@ impl<'a, 'tcx, V: CodegenObject> LocalRef<'tcx, V> {
 
 ///////////////////////////////////////////////////////////////////////////
 
+#[tracing::instrument(level = "debug", skip(cx))]
 pub fn codegen_mir<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     cx: &'a Bx::CodegenCx,
     instance: Instance<'tcx>,