Auto merge of rust-lang#125663 - matthiaskrgr:rollup-ej3yuxm, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#117671 (NVPTX: Avoid PassMode::Direct for args in C abi)
 - rust-lang#124251 (Add an intrinsic for `ptr::metadata`)
 - rust-lang#125573 (Migrate `run-make/allow-warnings-cmdline-stability` to `rmake.rs`)
 - rust-lang#125590 (Add a "Setup Python" action for github-hosted runners and remove unnecessary `CUSTOM_MINGW` environment variable)
 - rust-lang#125598 (Make `ProofTreeBuilder` actually generic over `Interner`)
 - rust-lang#125637 (rustfmt fixes)

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

Author: bors

compiler/rustc_mir_transform/src/instsimplify.rs

@@ -219,10 +219,8 @@ impl<'tcx> InstSimplifyContext<'tcx, '_> {
                     for (i, field) in variant.fields.iter_enumerated() {
                         let field_ty = field.ty(self.tcx, args);
                         if field_ty == *cast_ty {
-                            let place = place.project_deeper(
-                                &[ProjectionElem::Field(i, *cast_ty)],
-                                self.tcx,
-                            );
+                            let place = place
+                                .project_deeper(&[ProjectionElem::Field(i, *cast_ty)], self.tcx);
                             let operand = if operand.is_move() {
                                 Operand::Move(place)
                             } else {

compiler/rustc_mir_transform/src/lower_intrinsics.rs

@@ -316,6 +316,23 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
 
                         terminator.kind = TerminatorKind::Goto { target };
                     }
+                    sym::ptr_metadata => {
+                        let Ok([ptr]) = <[_; 1]>::try_from(std::mem::take(args)) else {
+                            span_bug!(
+                                terminator.source_info.span,
+                                "Wrong number of arguments for ptr_metadata intrinsic",
+                            );
+                        };
+                        let target = target.unwrap();
+                        block.statements.push(Statement {
+                            source_info: terminator.source_info,
+                            kind: StatementKind::Assign(Box::new((
+                                *destination,
+                                Rvalue::UnaryOp(UnOp::PtrMetadata, ptr.node),
+                            ))),
+                        });
+                        terminator.kind = TerminatorKind::Goto { target };
+                    }
                     _ => {}
                 }
             }

compiler/rustc_mir_transform/src/promote_consts.rs

@@ -464,7 +464,7 @@ impl<'tcx> Validator<'_, 'tcx> {
             Rvalue::UnaryOp(op, operand) => {
                 match op {
                     // These operations can never fail.
-                    UnOp::Neg | UnOp::Not => {}
+                    UnOp::Neg | UnOp::Not | UnOp::PtrMetadata => {}
                 }
 
                 self.validate_operand(operand)?;