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_expand/src/proc_macro.rs

@@ -127,7 +127,7 @@ impl MultiItemModifier for DeriveProcMacro {
                 Annotatable::Stmt(stmt) => token::NtStmt(stmt),
                 _ => unreachable!(),
             };
-            TokenStream::token_alone(token::Interpolated(Lrc::new((nt, span))), DUMMY_SP)
+            TokenStream::token_alone(token::Interpolated(Lrc::new(nt)), DUMMY_SP)
         } else {
             item.to_tokens()
         };