vm.c: merge code

* vm.c (m_core_hash_from_ary, m_core_hash_merge_ary): merge
  duplicated code.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45399 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm.c: extract core_hash_merge

* vm.c (core_hash_merge): extract from m_core_hash_merge_ary and
  m_core_hash_merge_ptr.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45400 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-03-25

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45401 b2dd03c8-39d4-4d8f-98ff-823fe69b080e