vm_insnhelper.c: fix unusable super class

* vm_insnhelper.c (vm_call_method): unusable super class should cause
  method missing when BasicObject is refined but not been using.
  [ruby-core:64166] [Bug #10106]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47037 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-08-03

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47038 b2dd03c8-39d4-4d8f-98ff-823fe69b080e