Move stack and stack_mut implementation in Machine to match their pos…

…ition in the trait.

src/machine.rs

@@ -318,20 +318,6 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
         memory_extra.check_alignment
     }
 
-    #[inline(always)]
-    fn stack<'a>(
-        ecx: &'a InterpCx<'mir, 'tcx, Self>,
-    ) -> &'a [Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>] {
-        &ecx.machine.stack
-    }
-
-    #[inline(always)]
-    fn stack_mut<'a>(
-        ecx: &'a mut InterpCx<'mir, 'tcx, Self>,
-    ) -> &'a mut Vec<Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>> {
-        &mut ecx.machine.stack
-    }
-
     #[inline(always)]
     fn enforce_validity(ecx: &InterpCx<'mir, 'tcx, Self>) -> bool {
         ecx.machine.validate
@@ -531,6 +517,20 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
         Ok(frame.with_extra(extra))
     }
 
+    #[inline(always)]
+    fn stack<'a>(
+        ecx: &'a InterpCx<'mir, 'tcx, Self>,
+    ) -> &'a [Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>] {
+        &ecx.machine.stack
+    }
+
+    #[inline(always)]
+    fn stack_mut<'a>(
+        ecx: &'a mut InterpCx<'mir, 'tcx, Self>,
+    ) -> &'a mut Vec<Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>> {
+        &mut ecx.machine.stack
+    }
+
     #[inline(always)]
     fn after_stack_push(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
         if ecx.memory.extra.stacked_borrows.is_some() {