Fix memory leak in parser for invalid syntax

The strterm is leaked when there is invalid syntax.

For example:

    10.times do
      100_000.times do
        begin
          RubyVM::InstructionSequence.compile('private def foo = puts "Hello"')
        rescue SyntaxError
        end
      end

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

Before:

    20384
    26256
    32592
    36720
    42016
    47888
    53248
    57456
    62928
    65936

After:

    16720
    17488
    17616
    17616
    17616
    17616
    17616
    17616
    17616
    16032

Co-Authored-By: Kevin Newton <kddnewton@gmail.com>

0 files changed, 0 insertions, 0 deletions