ZJIT: fix defined?(method call expr)

[tekknolagi]

Currently buggy. Not sure why. Repro:

class C
  def assert_equal expected, actual
    if expected != actual
      raise "NO"
    end
  end

  def test_defined_method
    assert_equal(nil, defined?("x".reverse(1).reverse))
  end
end

c = C.new
c.test_defined_method
c.test_defined_method
c.test_defined_method

Adding a temporary side-exit into HIR building to work around this. To reproduce this bug, remove the side-exit.

[st0012]

This doesn't reproduce on master anymore

[tekknolagi]

That's because we have a TODO side-exit in the HIR builder.

[st0012]

No I mean even after removing the workaround

[tekknolagi]

Huh. Looks like 5b5b5b3 (ruby#14308) fixed it (git bisected).

[tekknolagi]

I'll file a PR to close it out.