util: inspect: do not crash on an Error stack with a regex name

See #56570

Author: ljharb

lib/internal/util/inspect.js

@@ -1354,7 +1354,7 @@ function removeDuplicateErrorKeys(ctx, keys, err, stack) {
     for (const name of ['name', 'message', 'stack']) {
       const index = ArrayPrototypeIndexOf(keys, name);
       // Only hide the property in case it's part of the original stack
-      if (index !== -1 && StringPrototypeIncludes(stack, err[name])) {
+      if (index !== -1 && StringPrototypeIncludes(stack, String(err[name]))) {
         ArrayPrototypeSplice(keys, index, 1);
       }
     }

test/parallel/test-util-inspect.js

@@ -3426,3 +3426,14 @@ assert.strictEqual(
     Object.defineProperty(BuiltinPrototype, 'constructor', desc);
   }
 }
+
+{
+  const error = new Error();
+  const re = /a/g;
+  error.name = re;
+  assert.strictEqual(error.name, re);
+  assert.strictEqual(
+    util.inspect(error),
+    error.stack,
+  );
+}