Auto merge of #148721 - Zalathar:rollup-398va3y, r=Zalathar

Rollup of 22 pull requests

Successful merges:

 - rust-lang/rust#128666 (Add `overflow_checks` intrinsic)
 - rust-lang/rust#146305 (Add correct suggestion for multi-references for self type in method)
 - rust-lang/rust#147179 ([DebugInfo] Fix container types failing to find template args)
 - rust-lang/rust#147743 (Show packed field alignment in mir_transform_unaligned_packed_ref)
 - rust-lang/rust#148079 (Rename `downcast_[ref|mut]_unchecked` -> `downcast_unchecked_[ref|mut]`)
 - rust-lang/rust#148084 (Optimize path components iteration on platforms that don't have prefixes)
 - rust-lang/rust#148126 (Fix rust stdlib build failing for VxWorks)
 - rust-lang/rust#148204 (Modify contributor email entries in .mailmap)
 - rust-lang/rust#148279 (rustc_builtin_macros: rename bench parameter to avoid collisions with user-defined function names)
 - rust-lang/rust#148333 (constify result unwrap unchecked)
 - rust-lang/rust#148539 (Add Allocator proxy impls for Box, Rc, and Arc)
 - rust-lang/rust#148601 (`invalid_atomic_ordering`: also lint `update` & `try_update`)
 - rust-lang/rust#148612 (Add note for identifier with attempted hygiene violation)
 - rust-lang/rust#148613 (Switch hexagon targets to rust-lld)
 - rust-lang/rust#148619 (Enable std locking functions on AIX)
 - rust-lang/rust#148644 ([bootstrap] Make `--open` option work with `doc src/tools/error_index_generator`)
 - rust-lang/rust#148649 (don't completely reset `HeadUsages`)
 - rust-lang/rust#148673 (Remove a remnant of `dyn*` from the parser)
 - rust-lang/rust#148675 (Remove eslint-js from npm dependencies)
 - rust-lang/rust#148680 (Recover `[T: N]` as `[T; N]`)
 - rust-lang/rust#148688 (Remove unused argument `features` from `eval_config_entry`)
 - rust-lang/rust#148711 (Use the current lint note id when parsing `cfg!()`)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

src/base.rs

@@ -865,17 +865,8 @@ fn codegen_stmt<'tcx>(fx: &mut FunctionCx<'_, '_, 'tcx>, cur_block: Block, stmt:
                                 fields.iter(),
                             )
                             .bytes(),
-                        NullOp::UbChecks => {
-                            let val = fx.tcx.sess.ub_checks();
-                            let val = CValue::by_val(
-                                fx.bcx.ins().iconst(types::I8, i64::from(val)),
-                                fx.layout_of(fx.tcx.types.bool),
-                            );
-                            lval.write_cvalue(fx, val);
-                            return;
-                        }
-                        NullOp::ContractChecks => {
-                            let val = fx.tcx.sess.contract_checks();
+                        NullOp::RuntimeChecks(kind) => {
+                            let val = kind.value(fx.tcx.sess);
                             let val = CValue::by_val(
                                 fx.bcx.ins().iconst(types::I8, i64::from(val)),
                                 fx.layout_of(fx.tcx.types.bool),