Revert "Revert "Manage AST NODEs out of GC""
This re-introduces r60485. This reverts commit 5a176b75b1187cbd3861c387bde65ff66396a07c.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60488 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Revert "Revert "Manage AST NODEs out of GC""
This re-introduces r60485.
This reverts commit 5a176b75b1187cbd3861c387bde65ff66396a07c.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60488 b2dd03c8-39d4-4d8f-98ff-823fe69b080e