boa_tester stack overflows in debug mode

[hansl]

Running the boa_tester in debug in the main branch aborts with a stack overflow.

In release mode everything seems fine, but we should still investigate.

[jasonwilliams]

Yeah I think we're going to have to fix this properly, if you run the benchmarks in debug mode (just the first one or second one) it also stack overflows.

I think we're gonna have to find the smallest test case that causes this and try to fix it, it's happening at the parser level.