Fix invalid lint_node_id being put on a removed stmt

compiler/rustc_expand/src/expand.rs

@@ -1841,7 +1841,7 @@ fn flat_map_generic_param(
         self.flat_map_node(node)
     }
 
-    fn flat_map_stmt(&mut self, mut node: ast::Stmt) -> SmallVec<[ast::Stmt; 1]> {
+    fn flat_map_stmt(&mut self, node: ast::Stmt) -> SmallVec<[ast::Stmt; 1]> {
         // FIXME: invocations in semicolon-less expressions positions are expanded as expressions,
         // changing that requires some compatibility measures.
         if node.is_expr() {
@@ -1863,7 +1863,7 @@ fn flat_map_generic_param(
                     self.cx.current_expansion.is_trailing_mac = false;
                     res
                 }
-                _ => assign_id!(self, &mut node.id, || noop_flat_map_stmt(node, self)),
+                _ => noop_flat_map_stmt(node, self),
             };
         }
 

src/test/ui/check-cfg/stmt-no-ice.rs

+// This test checks that there is no ICE with this code
+//
+// check-pass
+// compile-flags:--check-cfg=names() -Z unstable-options
+
+fn main() {
+    #[cfg(crossbeam_loom)]
+    //~^ WARNING unexpected `cfg` condition name
+    {}
+}

src/test/ui/check-cfg/stmt-no-ice.stderr

+warning: unexpected `cfg` condition name
+  --> $DIR/stmt-no-ice.rs:7:11
+   |
+LL |     #[cfg(crossbeam_loom)]
+   |           ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(unexpected_cfgs)]` on by default
+
+warning: 1 warning emitted
+