[ruby/irb] Pass local variables from workspace binding to lexer

This fixes at least an issue where irb will incorrectly assume
code opens a heredoc when it does not, such as this code:

```ruby
s1 = 'testing'
s2 = 'this'
s2 <<s1
p s1
s1
```

Ruby parses the `s2 <<s1` as `s2.<<(s1)`, not as a heredoc, because
`s2` is a local variable in scope.  irb was using ripper without
letting ripper know that `s2` was a local variable, so ripper would
lex it as a heredoc instead of a method call.

Fix the situation by prepending a line at line 0 with all local
variable definitions in scope whenever lexing.  This fixes the
heredoc issue, and potentially other issues that depend on whether
an identifier is a local variable or not.

Fixes [Bug #17530]

https://github.com/ruby/irb/commit/4ed2187f76

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