[libc++] Refactor tests for hijacked address operator in vector (#117457)

This reduces the amount of boilerplate needed to implement the tests.

Author: ldionne

libcxx/test/std/containers/sequences/vector/addressof.compile.pass.cpp

@@ -0,0 +1,47 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03 && !stdlib=libc++
+
+// <vector>
+
+// Validate various member functions of std::vector with an ADL-hijacking operator&
+
+#include <vector>
+#include <utility>
+
+#include "operator_hijacker.h"
+#include "test_iterators.h"
+
+using Vector = std::vector<operator_hijacker>;
+
+void test(
+    Vector v, Vector::const_iterator it, cpp17_input_iterator<operator_hijacker*> other_it, operator_hijacker val) {
+  // emplace / insert
+  v.emplace(it);
+  v.insert(it, it, it);
+  v.insert(it, other_it, other_it);
+  v.insert(it, operator_hijacker());
+  v.insert(it, 1, val);
+  v.insert(it, val);
+
+  // erase
+  v.erase(it);
+  v.erase(it, it);
+
+  // assignment
+  v = static_cast<Vector&>(v);
+  v = std::move(v);
+
+  // construction
+  { Vector v2(std::move(v)); }
+  { Vector v2(std::move(v), std::allocator<operator_hijacker>()); }
+
+  // swap
+  v.swap(v);
+}