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folding is always 0EV (you never win anything by folding, but you never loose anything either)
here are some numbers
Make up a different scenario (villian raise, I reraise to 20BB, he pushes) and you have to be very sure he does push w/ QQ, AK, AQ etc to make a call +EV
And in the NL50, NL100 FR games of fulltilt I never saw someone 4bet 100BB all in vs a 100BB stack with AQ or QQ. Even AK is very very rare.
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This post is coming dangerously close to suggesting you can fold KK 100BB deep in a typical 50NL online game against 1 opponent...so I feel the need to say that is completely wrong & you'll give up lots of equity when you do it