Revert "Fix (hopefully) part #2 of issue #117 for non-parallel hash maps"

This reverts commit 3f02d81926.

parallel_hashmap/phmap.h

@@ -1441,17 +1441,6 @@ public:
         slot_type** slot_;
     };
 
-    struct fpi_result 
-    {
-        ~fpi_result() { if (second) set->set_ctrl(first, H2(hashval)); }
-
-        raw_hash_set *set;
-        size_t hashval;
-        size_t first;
-        bool second;
-    };
-        
-
     template <class K = key_type, class F>
     iterator lazy_emplace(const key_arg<K>& key, F&& f) {
         auto res = find_or_prepare_insert(key);
@@ -2093,7 +2082,7 @@ private:
 
 protected:
     template <class K>
-    fpi_result find_or_prepare_insert(const K& key, size_t hashval) {
+    std::pair<size_t, bool> find_or_prepare_insert(const K& key, size_t hashval) {
         auto seq = probe(hashval);
         while (true) {
             Group g{ctrl_ + seq.offset()};
@@ -2101,16 +2090,16 @@ protected:
                 if (PHMAP_PREDICT_TRUE(PolicyTraits::apply(
                                           EqualElement<K>{key, eq_ref()},
                                           PolicyTraits::element(slots_ + seq.offset((size_t)i)))))
-                    return {this, hashval, seq.offset((size_t)i), false};
+                    return {seq.offset((size_t)i), false};
             }
             if (PHMAP_PREDICT_TRUE(g.MatchEmpty())) break;
             seq.next();
         }
-        return {this, hashval, prepare_insert(hashval), true};
+        return {prepare_insert(hashval), true};
     }
 
     template <class K>
-    fpi_result find_or_prepare_insert(const K& key) {
+    std::pair<size_t, bool> find_or_prepare_insert(const K& key) {
         return find_or_prepare_insert(key, this->hash(key));
     }
 
@@ -2123,6 +2112,7 @@ protected:
         }
         ++size_;
         growth_left() -= IsEmpty(ctrl_[target.offset]);
+        set_ctrl(target.offset, H2(hashval));
         infoz_.RecordInsert(hashval, target.probe_length);
         return target.offset;
     }