Port #[no_implicit_prelude] to the new attribute parsing infrastructure

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

compiler/rustc_parse/src/validate_attr.rs

@@ -310,6 +310,7 @@ fn emit_malformed_attribute(
             | sym::link_section
             | sym::rustc_layout_scalar_valid_range_start
             | sym::rustc_layout_scalar_valid_range_end
+            | sym::no_implicit_prelude
     ) {
         return;
     }