[io] Rename Internal::Hash to Internal::ShortHash

as suggested by axel/pcanal

Author: ferdymercury

io/io/inc/ROOT/RConcurrentHashColl.hxx

@@ -45,8 +45,8 @@ public:
       HashValue(const char *data, int len);
       ULong64_t const *Get() const { return fDigest; }
 
-      /// Return the hash value for this object
-      size_t Hash() const noexcept
+      /// Return the 64-bit hash of this 256-bit long digest/hash (4 x 64-bit)
+      size_t ShortHash() const noexcept
       {
          std::hash<ULong64_t> hasher;
          return hasher(fDigest[0]) ^ hasher(fDigest[1]) ^ hasher(fDigest[2]) ^ hasher(fDigest[3]);

io/io/src/RConcurrentHashColl.cxx

@@ -12,7 +12,7 @@ template <>
 struct hash<ROOT::Internal::RConcurrentHashColl::HashValue> {
    std::size_t operator()(const ROOT::Internal::RConcurrentHashColl::HashValue &key) const noexcept
    {
-      return key.Hash();
+      return key.ShortHash();
    }
 };
 } // namespace std