Remove all uses of to_ptr

rust-version

@@ -1 +1 @@
-9ae6cedb8d1e37469be1434642a3e403fce50a03
+8f5f8f916f00f7989a4ebf7b7dbfe1afd605f828

src/shims/foreign_items.rs

@@ -271,7 +271,6 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
                 )?;
             }
             "__rust_realloc" => {
-                let ptr = this.read_scalar(args[0])?.to_ptr()?;
                 let old_size = this.read_scalar(args[1])?.to_machine_usize(this)?;
                 let align = this.read_scalar(args[2])?.to_machine_usize(this)?;
                 let new_size = this.read_scalar(args[3])?.to_machine_usize(this)?;
@@ -281,6 +280,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
                 if !align.is_power_of_two() {
                     throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
                 }
+                let ptr = this.force_ptr(this.read_scalar(args[0])?.not_undef()?)?;
                 let align = Align::from_bytes(align).unwrap();
                 let new_ptr = this.memory.reallocate(
                     ptr,

src/shims/intrinsics.rs

@@ -575,7 +575,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
                             // Do it in memory
                             let mplace = this.force_allocation(dest)?;
                             mplace.meta.unwrap_none();
-                            let ptr = mplace.ptr.to_ptr()?;
+                            let ptr = mplace.ptr.assert_ptr();
                             // We know the return place is in-bounds
                             this.memory.get_raw_mut(ptr.alloc_id)?.mark_definedness(
                                 ptr,

src/stacked_borrows.rs

@@ -507,7 +507,7 @@ trait EvalContextPrivExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
     ) -> InterpResult<'tcx> {
         let this = self.eval_context_mut();
         let protector = if protect { Some(this.frame().extra.call_id) } else { None };
-        let ptr = place.ptr.to_ptr().expect("we should have a proper pointer");
+        let ptr = place.ptr.assert_ptr();
         trace!(
             "reborrow: {} reference {:?} derived from {:?} (pointee {}): {:?}, size {}",
             kind,