Reduce String allocations when building Action View tags

This method is called against each tag option for each tag,
and creates an extra garbage String per each call

actionview/lib/action_view/helpers/tag_helper.rb

@@ -90,7 +90,8 @@ def tag_option(key, value, escape)
           else
             value = escape ? ERB::Util.unwrapped_html_escape(value) : value.to_s
           end
-          %(#{key}="#{value.gsub('"'.freeze, '"'.freeze)}")
+          value.gsub!('"'.freeze, '"'.freeze)
+          %(#{key}="#{value}")
         end
 
         private