undefined ES5 getters/setters broken again

[jklmli]

8b35f9d overrode some of the fixes committed in e869f18

[paulfalgout]

Hmm.. I think some commenting is in order to prevent this from happening again. Or is there anyway we could accurately test this? Failing tests would be even better. Otherwise I could certainly see this happening again.

[jasonLaster]

Hmm, yea please submit a fix and comments or tests

[blikblum]

Anyone knows how to reproduce the issue, so i can add tests?
@jiaweihli