[Bug #19836]

The parser does not free the chain of `struct vtable`, which causes
memory leaks.

The following script reproduces this issue:

```
10.times do
  100_000.times do
    Ripper.parse("-> {")
  end

  puts `ps -o rss= -p #{$$}`
end
```

[Bug #19835]

The parser does not free the `tbl` of the `struct vtable` when there are
leftover `lvtbl` in the parser. This causes a memory leak.

The following script reproduces this issue:

```
10.times do
  100_000.times do
    Ripper.parse("class Foo")
  end

  puts `ps -o rss= -p #{$$}`
end
```

In `rb_ruby_ripper_parser_allocate`, `r->p` is NULL between creating
`self` and `parser_params` assignment.  As GC can happen there, the
typed-data functions for it need to consider the case.

The test times out on some platforms, so increase the timeout.

The following script leaks memory in Ripper:

```ruby
require "ripper"

20.times do
  100_000.times do
    Ripper.parse("")
  end

  puts `ps -o rss= -p #{$$}`
end
```

* parse.y (parser_token_value_print): in ripper, ID values are
  wrapped in NODE_RIPPER at set_yylval_name(), so print the Symbol
  wrapped together.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67305 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* parse.y (ripper_state): add states of scanner to tokens from
  Ripper.lex and Ripper::Filter#on_*.  based on the patch by
  aycabta (Code Ahss) at [ruby-core:81789].  [Feature #13686]

* ext/ripper/tools/preproc.rb (prelude, usercode): generate EXPR_*
  constants from enums.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59896 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57538 b2dd03c8-39d4-4d8f-98ff-823fe69b080e