* bootstraptest/test_autoload.rb, bootstraptest/test_method.rb:
  remove tests for $SAFE=4.

* lib/pp.rb: use taint instead of untrust to avoid warnings when
  $VERBOSE is set to true.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41269 b2dd03c8-39d4-4d8f-98ff-823fe69b080e