Remove a Span from TokenKind::Interpolated.

This span records the declaration of the metavariable in the LHS of the macro.
It's used in a couple of error messages. Unfortunately, it gets in the way of
the long-term goal of removing `TokenKind::Interpolated`. So this commit
removes it, which degrades a couple of (obscure) error messages but makes
things simpler and enables the next commit.

compiler/rustc_parse/src/parser/expr.rs

@@ -45,7 +45,7 @@ use thin_vec::{thin_vec, ThinVec};
 macro_rules! maybe_whole_expr {
     ($p:expr) => {
         if let token::Interpolated(nt) = &$p.token.kind {
-            match &nt.0 {
+            match &**nt {
                 token::NtExpr(e) | token::NtLiteral(e) => {
                     let e = e.clone();
                     $p.bump();