compile.c: append keyword hash to splat

* compile.c (iseq_compile_each): append keyword hash to argument array
  to splat if needed.  [ruby-core:54094] [Bug #8236]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40205 b2dd03c8-39d4-4d8f-98ff-823fe69b080e