test_rubyoptions.rb: split test_segv_test

* test/ruby/test_rubyoptions.rb (test_segv_test): split assertions to
  each tests.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42205 b2dd03c8-39d4-4d8f-98ff-823fe69b080e