rethrow the caught exception as-is

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63787 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/runner.rb

@@ -255,7 +255,7 @@ def show_progress(message = '')
   end
 rescue Interrupt
   $stderr.puts "\##{@count} #{@location}"
-  raise Interrupt
+  raise
 rescue Exception => err
   $stderr.print 'E'
   $stderr.puts if @verbose