Suggest boxed trait objects in tail match and if expressions

When encountering a `match` or `if` as a tail expression where the
different arms do not have the same type *and* the return type of that
`fn` is an `impl Trait`, check whether those arms can implement `Trait`
and if so, suggest using boxed trait objects.

compiler/rustc_middle/src/traits/mod.rs

@@ -350,13 +350,16 @@ pub struct MatchExpressionArmCause<'tcx> {
     pub prior_arms: Vec<Span>,
     pub last_ty: Ty<'tcx>,
     pub scrut_hir_id: hir::HirId,
+    pub suggest_box: Option<Span>,
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct IfExpressionCause {
     pub then: Span,
+    pub else_sp: Span,
     pub outer: Option<Span>,
     pub semicolon: Option<Span>,
+    pub suggest_box: Option<Span>,
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Lift)]