Make SpanlessEq more consistent 1) Remove wildcard as requested in https://github.com/rust-lang/rust-clippy/issues/10267. 2) Implement `hir_utils::eq_expr` for `ExprKind::Closure`, `ExprKind::ConstBlock`, `ExprKind::InlineAsm` and `ExprKind::Yield`. 3) Reorder branches of `hir_utils::eq_expr` to be in alphabetical order. --- changelog: none