parse.y: duplicate code

* parse.y (f_larglist): remove duplicate code in ripper.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y: adjust position of lambda

* parse.y (lambda): adjust position to the beginning of the block.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42980 b2dd03c8-39d4-4d8f-98ff-823fe69b080e