Move report_cycle to rustc_query_system.

The call to `ty::print::with_forced_impl_filename_line`
is done when constructing the description,
at the construction of the QueryStackFrame.

compiler/rustc_query_impl/src/lib.rs

@@ -18,7 +18,7 @@ extern crate tracing;
 
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
-use rustc_errors::{Diagnostic, Handler, Level};
+use rustc_errors::{Diagnostic, DiagnosticBuilder, Handler, Level};
 use rustc_hir::def_id::CrateNum;
 use rustc_index::vec::IndexVec;
 use rustc_middle::dep_graph;