test_array.rb: do minor GC
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45561 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_array.rb: do minor GC
reduce WB-missed messages.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45561 b2dd03c8-39d4-4d8f-98ff-823fe69b080e