Add efficient firstGeq overload for latestVersion

include/VersionedMap.h

@@ -158,6 +158,11 @@ struct __attribute__((__visibility__("default"))) VersionedMap {
   void firstGeq(const Key *key, const int64_t *version, Iterator *iterator,
                 int count) const;
 
+  /** Equivalent to `firstGeq(key, version, iterator, 1)` where each element in
+   * `version` is the latest version, but more efficient.
+   */
+  void firstGeq(const Key *key, Iterator *iterator, int count) const;
+
   /** Returns an iterator to the first mutation visible in the view at
    * `version`, or `end()` if none exists. Thread-safe as long as `version` is
    * not concurrently invalidated by `setOldestVersion`. */