* vm.c (eval_get_cvar_base): destination for class variable access

  is now strictly innermost surrounding class or module.  warned
  if accessed from toplevel.

* variable.c (rb_cvar_get): new class variable look-up scheme:
  1) look up in the class.  2) if the class is singleton attached
  to a class (i.e. metaclass) then start look up in the attached
  class and its ancestors. 3) otherwise, look-up in ancestors of
  the class.

* eval.c (cvar_cbase): destination for class variable access is
  the class/module that holds the method, or cbase outside of
  methods.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11613 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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