[libc++][test] Fix size calculation for unordered_map in ABI test (#157006)

Currently,
`libcxx\test\libcxx\containers\associative\unord.map\abi.compile.pass.cpp`
consistently fails for 32-bit platforms.

There's an off-by-4 size calculation error for some `unordered_map`
specializations, possibly due to mistakenly ignoring some data member.

Author: frederick-vs-ja

libcxx/test/libcxx/containers/associative/unord.map/abi.compile.pass.cpp

@@ -209,9 +209,9 @@ static_assert(TEST_ALIGNOF(unordered_map_alloc<char, final_small_iter_allocator<
               "");
 
 static_assert(sizeof(std::unordered_map<int, int, FinalHash, UnalignedEqualTo>) == 24, "");
-static_assert(sizeof(std::unordered_map<int, int, FinalHash, FinalEqualTo>) == 24, "");
-static_assert(sizeof(std::unordered_map<int, int, NonEmptyHash, FinalEqualTo>) == 28, "");
-static_assert(sizeof(std::unordered_map<int, int, NonEmptyHash, NonEmptyEqualTo>) == 32, "");
+static_assert(sizeof(std::unordered_map<int, int, FinalHash, FinalEqualTo>) == 28, "");
+static_assert(sizeof(std::unordered_map<int, int, NonEmptyHash, FinalEqualTo>) == 32, "");
+static_assert(sizeof(std::unordered_map<int, int, NonEmptyHash, NonEmptyEqualTo>) == 36, "");
 
 static_assert(TEST_ALIGNOF(std::unordered_map<int, int, FinalHash, UnalignedEqualTo>) == 4, "");
 static_assert(TEST_ALIGNOF(std::unordered_map<int, int, FinalHash, FinalEqualTo>) == 4, "");