* gc.c: Fix typos. These are undefined variables.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45730 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* gc.c: This argument must be a pointer.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45731 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-04-28

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45732 b2dd03c8-39d4-4d8f-98ff-823fe69b080e