Remove fields that are dead since the removal of type ascription syntax

Since `{ ident: ident }` is a parse error, these fields are dead.

compiler/rustc_builtin_macros/src/autodiff.rs

@@ -395,7 +395,6 @@ mod llvm_enzyme {
             tokens: None,
             rules: unsf,
             span,
-            could_be_bare_literal: false,
         };
         let unsf_expr = ecx.expr_block(P(unsf_block));
         let blackbox_call_expr = ecx.expr_path(ecx.path(span, blackbox_path));

compiler/rustc_builtin_macros/src/deriving/mod.rs

@@ -110,7 +110,6 @@ fn call_unreachable(cx: &ExtCtxt<'_>, span: Span) -> P<ast::Expr> {
         rules: ast::BlockCheckMode::Unsafe(ast::CompilerGenerated),
         span,
         tokens: None,
-        could_be_bare_literal: false,
     }))
 }