[libc++] Fix hash_multi{map,set}::insert (#149290)

(cherry picked from commit be3d614cc13f016b16634e18e10caed508d183d2)

libcxx/include/ext/hash_map

@@ -744,7 +744,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI const_iterator begin() const { return __table_.begin(); }
   _LIBCPP_HIDE_FROM_ABI const_iterator end() const { return __table_.end(); }
 
-  _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return __table_.__emplace_unique(__x); }
+  _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return __table_.__emplace_multi(__x); }
   _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator, const value_type& __x) { return insert(__x); }
   template <class _InputIterator>
   _LIBCPP_HIDE_FROM_ABI void insert(_InputIterator __first, _InputIterator __last);
@@ -831,7 +831,7 @@ template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
 template <class _InputIterator>
 inline void hash_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::insert(_InputIterator __first, _InputIterator __last) {
   for (; __first != __last; ++__first)
-    __table_.__emplace_unique(*__first);
+    __table_.__emplace_multi(*__first);
 }
 
 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>

libcxx/include/ext/hash_set

@@ -458,7 +458,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI const_iterator begin() const { return __table_.begin(); }
   _LIBCPP_HIDE_FROM_ABI const_iterator end() const { return __table_.end(); }
 
-  _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return __table_.__emplace_unique(__x); }
+  _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return __table_.__emplace_multi(__x); }
   _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator, const value_type& __x) { return insert(__x); }
   template <class _InputIterator>
   _LIBCPP_HIDE_FROM_ABI void insert(_InputIterator __first, _InputIterator __last);
@@ -543,7 +543,7 @@ template <class _Value, class _Hash, class _Pred, class _Alloc>
 template <class _InputIterator>
 inline void hash_multiset<_Value, _Hash, _Pred, _Alloc>::insert(_InputIterator __first, _InputIterator __last) {
   for (; __first != __last; ++__first)
-    __table_.__emplace_unique(*__first);
+    __table_.__emplace_multi(*__first);
 }
 
 template <class _Value, class _Hash, class _Pred, class _Alloc>

libcxx/test/extensions/gnu/hash_multimap/insert.pass.cpp

@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// ADDITIONAL_COMPILE_FLAGS: -Wno-deprecated
+
+// hash_multimap::insert
+
+#include <cassert>
+#include <ext/hash_map>
+
+int main(int, char**) {
+  __gnu_cxx::hash_multimap<int, int> map;
+
+  map.insert(std::make_pair(1, 1));
+  map.insert(std::make_pair(1, 1));
+
+  assert(map.size() == 2);
+  assert(map.equal_range(1).first == map.begin());
+  assert(map.equal_range(1).second == map.end());
+
+  std::pair<int, int> arr[] = {std::make_pair(1, 1), std::make_pair(1, 1)};
+
+  map.insert(arr, arr + 2);
+
+  assert(map.size() == 4);
+  assert(map.equal_range(1).first == map.begin());
+  assert(map.equal_range(1).second == map.end());
+
+  return 0;
+}

libcxx/test/extensions/gnu/hash_multiset/insert.pass.cpp

@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// ADDITIONAL_COMPILE_FLAGS: -Wno-deprecated
+
+// hash_multimap::insert
+
+#include <cassert>
+#include <ext/hash_set>
+
+int main(int, char**) {
+  __gnu_cxx::hash_multiset<int> map;
+
+  map.insert(1);
+  map.insert(1);
+
+  assert(map.size() == 2);
+  assert(map.equal_range(1).first == map.begin());
+  assert(map.equal_range(1).second == map.end());
+
+  int arr[] = {1, 1};
+
+  map.insert(arr, arr + 2);
+
+  assert(map.size() == 4);
+  assert(map.equal_range(1).first == map.begin());
+  assert(map.equal_range(1).second == map.end());
+
+  return 0;
+}