Revert "Preserve the .debug_gdb_scripts section"

This reverts commit 868bdde25b.

compiler/rustc_codegen_ssa/src/base.rs

@@ -609,7 +609,15 @@ pub fn collect_debugger_visualizers_transitive(
 ) -> BTreeSet<DebuggerVisualizerFile> {
     tcx.debugger_visualizers(LOCAL_CRATE)
         .iter()
-        .chain(tcx.crates(()).iter().flat_map(|&cnum| tcx.debugger_visualizers(cnum)))
+        .chain(
+            tcx.crates(())
+                .iter()
+                .filter(|&cnum| {
+                    let used_crate_source = tcx.used_crate_source(*cnum);
+                    used_crate_source.rlib.is_some() || used_crate_source.rmeta.is_some()
+                })
+                .flat_map(|&cnum| tcx.debugger_visualizers(cnum)),
+        )
         .filter(|visualizer| visualizer.visualizer_type == visualizer_type)
         .cloned()
         .collect::<BTreeSet<_>>()

compiler/rustc_codegen_ssa/src/traits/debuginfo.rs

@@ -50,7 +50,7 @@ pub trait DebugInfoCodegenMethods<'tcx>: BackendTypes {
         scope_metadata: Self::DIScope,
         file: &SourceFile,
     ) -> Self::DIScope;
-    fn debuginfo_finalize(&mut self);
+    fn debuginfo_finalize(&self);
 
     // FIXME(eddyb) find a common convention for all of the debuginfo-related
     // names (choose between `dbg`, `debug`, `debuginfo`, `debug_info` etc.).