Convert `delayed_bug`s to `bug`s.

I have a suspicion that quite a few delayed bug paths are impossible to
reach, so I did an experiment.

I converted every `delayed_bug` to a `bug`, ran the full test suite,
then converted back every `bug` that was hit. A surprising number were
never hit.

The next commit will convert some more back, based on human judgment.

2 files changed, 2 insertions, 6 deletions

diff --git a/compiler/rustc_mir_transform/src/coroutine.rs b/compiler/rustc_mir_transform/src/coroutine.rs
index a0851aa557b..54b13a40e92 100644
--- a/compiler/rustc_mir_transform/src/coroutine.rs
+++ b/compiler/rustc_mir_transform/src/coroutine.rs
@@ -1615,11 +1615,7 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
                 (args.discr_ty(tcx), coroutine_kind.movability() == hir::Movability::Movable)
             }
             _ => {
-                tcx.dcx().span_delayed_bug(
-                    body.span,
-                    format!("unexpected coroutine type {coroutine_ty}"),
-                );
-                return;
+                tcx.dcx().span_bug(body.span, format!("unexpected coroutine type {coroutine_ty}"));
             }
         };
 
diff --git a/compiler/rustc_mir_transform/src/elaborate_drops.rs b/compiler/rustc_mir_transform/src/elaborate_drops.rs
index 8575f552f0a..03d952abad1 100644
--- a/compiler/rustc_mir_transform/src/elaborate_drops.rs
+++ b/compiler/rustc_mir_transform/src/elaborate_drops.rs
@@ -380,7 +380,7 @@ impl<'b, 'tcx> ElaborateDropsCtxt<'b, 'tcx> {
                 LookupResult::Parent(None) => {}
                 LookupResult::Parent(Some(_)) => {
                     if !replace {
-                        self.tcx.dcx().span_delayed_bug(
+                        self.tcx.dcx().span_bug(
                             terminator.source_info.span,
                             format!("drop of untracked value {bb:?}"),
                         );