* compile.c (iseq_compile_each): count flip-flop state in local iseq
	  not in each iseqs, so that the keys can be other than hidden
	  strings.  [ruby-core:47253] [Bug #6899]

	* vm_insnhelper.c (lep_svar_get, lep_svar_set, vm_getspecial): store
	  flip-flop states in an array instead of a hash.

	* iseq.c (set_relation): main iseq also can has local scope.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@38317 b2dd03c8-39d4-4d8f-98ff-823fe69b080e