pythongh-132013: use relaxed atomics in hash of frozenset (python#132014)

Use relaxed atomics in hash of `frozenset` to fix TSAN warning.

Author: kumaraditya303

Objects/setobject.c

@@ -718,18 +718,19 @@ _shuffle_bits(Py_uhash_t h)
    large primes with "interesting bit patterns" and that passed tests
    for good collision statistics on a variety of problematic datasets
    including powersets and graph structures (such as David Eppstein's
-   graph recipes in Lib/test/test_set.py) */
+   graph recipes in Lib/test/test_set.py).
+
+   This hash algorithm can be used on either a frozenset or a set.
+   When it is used on a set, it computes the hash value of the equivalent
+   frozenset without creating a new frozenset object. */
 
 static Py_hash_t
-frozenset_hash(PyObject *self)
+frozenset_hash_impl(PyObject *self)
 {
-    PySetObject *so = (PySetObject *)self;
+    PySetObject *so = _PySet_CAST(self);
     Py_uhash_t hash = 0;
     setentry *entry;
 
-    if (so->hash != -1)
-        return so->hash;
-
     /* Xor-in shuffled bits from every entry's hash field because xor is
        commutative and a frozenset hash should be independent of order.
 
@@ -762,7 +763,21 @@ frozenset_hash(PyObject *self)
     if (hash == (Py_uhash_t)-1)
         hash = 590923713UL;
 
-    so->hash = hash;
+    return (Py_hash_t)hash;
+}
+
+static Py_hash_t
+frozenset_hash(PyObject *self)
+{
+    PySetObject *so = _PySet_CAST(self);
+    Py_uhash_t hash;
+
+    if (FT_ATOMIC_LOAD_SSIZE_RELAXED(so->hash) != -1) {
+        return FT_ATOMIC_LOAD_SSIZE_RELAXED(so->hash);
+    }
+
+    hash = frozenset_hash_impl(self);
+    FT_ATOMIC_STORE_SSIZE_RELAXED(so->hash, hash);
     return hash;
 }