gc.c: skip unnecessary check
2*sizeof(VALUE)
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58665 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
gc.c: skip unnecessary check
2*sizeof(VALUE)is static and should never overflow.git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58665 b2dd03c8-39d4-4d8f-98ff-823fe69b080e