Make Ripper use NODE buffer

This is a follow-up of r60488.  Not only the Ruby parser but also Ripper
now use NODE buffer instead of NODE objects managed by GC.

Now we can change the struct of NODEs so that it can keep detailed
location information, perhaps (not tried yet).  Note that, however, the
first word of each NODE must be still compatible with RBasic structure.
This is because Ripper handles NODEs and other objects uniformly;
especially, it still uses `RB_TYPE_P(obj, T_NODE)` for distinguishing
between NODEs and other objects.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60639 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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