object_tracing.c: fix allocation from NEWOBJ hook
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44088 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
object_tracing.c: fix allocation from NEWOBJ hook
only to get rid object allocation during NEWOBJ hook.
[ruby-core:58853] [Bug #9212]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44088 b2dd03c8-39d4-4d8f-98ff-823fe69b080e