add suggestion on how to add a panic breakpoint

Co-authored-by: Pat Pannuto <[email protected]>

Author: alexandruradovici

compiler/rustc_codegen_ssa/src/codegen_attrs.rs

@@ -625,6 +625,9 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
                     .struct_span_err(no_mangle_span, "`#[no_mangle]` cannot be used on weak language items")
                     .with_note("The linker requires specific names for internal language items,")
                     .with_note("like panic handlers, eh personality functions or eh catch typeinfo variables.")
+                    .with_note("If you are trying to prevent mangling to ease debugging, many")
+                    .with_note("debuggers support a command such as `rbreak {sym}` to")
+                    .with_note("match `.*{sym}.*` instead of `break {sym}` on a specific name")
                     .with_span_label(tcx.def_span(did), label)
                     .with_span_label(span, label_attr);
                 if let Some(link_name) = lang_item.link_name() {