show if parallel test-all fails to Marshal.load

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46630 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-07-01

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46631 b2dd03c8-39d4-4d8f-98ff-823fe69b080e