Rollup merge of #99027 - tmiasko:basic-blocks, r=oli-obk

Replace `Body::basic_blocks()` with field access

Since the refactoring in #98930, it is possible to borrow the basic blocks
independently from other parts of MIR by accessing the `basic_blocks` field
directly.

Replace unnecessary `Body::basic_blocks()` method with a direct field access,
which has an additional benefit of borrowing the basic blocks only.

compiler/rustc_mir_transform/src/const_prop_lint.rs

@@ -105,7 +105,7 @@ impl<'tcx> MirLint<'tcx> for ConstProp {
 
         let dummy_body = &Body::new(
             body.source,
-            body.basic_blocks().clone(),
+            (*body.basic_blocks).clone(),
             body.source_scopes.clone(),
             body.local_decls.clone(),
             Default::default(),
@@ -522,7 +522,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
 
 impl<'tcx> Visitor<'tcx> for ConstPropagator<'_, 'tcx> {
     fn visit_body(&mut self, body: &Body<'tcx>) {
-        for (bb, data) in body.basic_blocks().iter_enumerated() {
+        for (bb, data) in body.basic_blocks.iter_enumerated() {
             self.visit_basic_block_data(bb, data);
         }
     }