Replace mir_built query with a hook and use mir_const everywhere instead

compiler/rustc_mir_transform/src/check_unsafety.rs

@@ -497,8 +497,8 @@ fn mir_unsafety_check_result(tcx: TyCtxt<'_>, def: LocalDefId) -> &UnsafetyCheck
     debug!("unsafety_violations({:?})", def);
 
     // N.B., this borrow is valid because all the consumers of
-    // `mir_built` force this.
-    let body = &tcx.mir_built(def).borrow();
+    // `mir_const` force this.
+    let body = &tcx.mir_const(def).borrow();
 
     if body.is_custom_mir() || body.tainted_by_errors.is_some() {
         return tcx.arena.alloc(UnsafetyCheckResult {

compiler/rustc_mir_transform/src/ffi_unwind_calls.rs

@@ -53,7 +53,7 @@ fn has_ffi_unwind_calls(tcx: TyCtxt<'_>, local_def_id: LocalDefId) -> bool {
         return false;
     }
 
-    let body = &*tcx.mir_built(local_def_id).borrow();
+    let body = &*tcx.mir_const(local_def_id).borrow();
 
     let body_ty = tcx.type_of(def_id).skip_binder();
     let body_abi = match body_ty.kind() {

compiler/rustc_mir_transform/src/lib.rs

@@ -288,10 +288,7 @@ fn mir_const(tcx: TyCtxt<'_>, def: LocalDefId) -> &Steal<Body<'_>> {
         tcx.ensure_with_value().mir_unsafety_check_result(def);
     }
 
-    // has_ffi_unwind_calls query uses the raw mir, so make sure it is run.
-    tcx.ensure_with_value().has_ffi_unwind_calls(def);
-
-    let mut body = tcx.mir_built(def).steal();
+    let mut body = tcx.build_mir(def);
 
     pass_manager::dump_mir_for_phase_change(tcx, &body);
 
@@ -339,6 +336,8 @@ fn mir_promoted(
         | DefKind::AnonConst => tcx.mir_const_qualif(def),
         _ => ConstQualifs::default(),
     };
+    // has_ffi_unwind_calls query uses the raw mir, so make sure it is run.
+    tcx.ensure_with_value().has_ffi_unwind_calls(def);
     let mut body = tcx.mir_const(def).steal();
     if let Some(error_reported) = const_qualifs.tainted_by_errors {
         body.tainted_by_errors = Some(error_reported);