Refactor: move iterator unchecked_* members before data members to comply with Google C++ style guide.

Also make unchecked_equals members `const`.

PiperOrigin-RevId: 781877490
Change-Id: I0bf5018f081a7a26e11fc67f3c344988b44a3ef3

Author: ezbr

absl/container/internal/raw_hash_set.h

@@ -2082,6 +2082,18 @@ class raw_hash_set {
       }
     }
 
+    // An equality check which skips ABSL Hardening iterator invalidation
+    // checks.
+    // Should be used when the lifetimes of the iterators are well-enough
+    // understood to prove that they cannot be invalid.
+    bool unchecked_equals(const iterator& b) const {
+      return ctrl_ == b.control();
+    }
+
+    // Dereferences the iterator without ABSL Hardening iterator invalidation
+    // checks.
+    reference unchecked_deref() const { return PolicyTraits::element(slot_); }
+
     ctrl_t* control() const { return ctrl_; }
     slot_type* slot() const { return slot_; }
 
@@ -2093,16 +2105,6 @@ class raw_hash_set {
     union {
       slot_type* slot_;
     };
-
-    // An equality check which skips ABSL Hardening iterator invalidation
-    // checks.
-    // Should be used when the lifetimes of the iterators are well-enough
-    // understood to prove that they cannot be invalid.
-    bool unchecked_equals(const iterator& b) { return ctrl_ == b.control(); }
-
-    // Dereferences the iterator without ABSL Hardening iterator invalidation
-    // checks.
-    reference unchecked_deref() const { return PolicyTraits::element(slot_); }
   };
 
   class const_iterator {
@@ -2143,14 +2145,13 @@ class raw_hash_set {
                    const GenerationType* gen)
         : inner_(const_cast<ctrl_t*>(ctrl), const_cast<slot_type*>(slot), gen) {
     }
+    bool unchecked_equals(const const_iterator& b) const {
+      return inner_.unchecked_equals(b.inner_);
+    }
     ctrl_t* control() const { return inner_.control(); }
     slot_type* slot() const { return inner_.slot(); }
 
     iterator inner_;
-
-    bool unchecked_equals(const const_iterator& b) {
-      return inner_.unchecked_equals(b.inner_);
-    }
   };
 
   using node_type = node_handle<Policy, hash_policy_traits<Policy>, Alloc>;