Ruby

csv.rb: performance with very long quoted lines

• lib/csv.rb (CSV#shift): store partial quoted strings in an array
  and join at last, to improve performance with very long quoted
  lines. [ruby-core:76987] [Bug #12691]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55985 b2dd03c8-39d4-4d8f-98ff-823fe69b080e