* vm_trace.c (rb_postponed_job_flush, rb_postponed_job_register): use
  ruby_xmalloc/xfree. It is safe during GC.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40953 b2dd03c8-39d4-4d8f-98ff-823fe69b080e