Ruby

Optimize each_sum for hashes

• enum.c (enum_sum, hash_sum, hash_sum_i, enum_sum_i, sum_iter):
  Optimize for hashes when each method isn't redefined.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55041 b2dd03c8-39d4-4d8f-98ff-823fe69b080e