* benchmark/gc/gcbench.rb: check GC::OPTS availability
  for not MRI 2.1.0.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44283 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* gc.c (newobj_of): don't need to RBASIC_SET_CLASS() which includes WB
  here because created obj is always YOUNG/INFANT.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44284 b2dd03c8-39d4-4d8f-98ff-823fe69b080e