Properly register text_direction_codepoint_in_comment lint.

compiler/rustc_lint_defs/src/builtin.rs

@@ -3054,6 +3054,7 @@ declare_lint_pass! {
         BREAK_WITH_LABEL_AND_LOOP,
         UNUSED_ATTRIBUTES,
         NON_EXHAUSTIVE_OMITTED_PATTERNS,
+        TEXT_DIRECTION_CODEPOINT_IN_COMMENT,
         DEREF_INTO_DYN_SUPERTRAIT,
     ]
 }

src/test/ui/lint/issue-90614-accept-allow-text-direction-codepoint-in-comment-lint.rs

@@ -0,0 +1,9 @@
+// check-pass
+// Allowing the code lint should work without warning and
+// the text flow char in the comment should be ignored.
+
+#![allow(text_direction_codepoint_in_comment)]
+
+fn main() {
+    // U+2066 LEFT-TO-RIGHT ISOLATE follows:⁦⁦
+}