merge revision(s) 45845,45847: [Backport #9786]

	* parse.y (local_tbl_gen): remove local variables duplicated with
	  arguments.
	  [ruby-core:60501] [Bug #9486]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@46731 b2dd03c8-39d4-4d8f-98ff-823fe69b080e