A weird bug in the preprocessor of PicoBlaze Simulator in JavaScript

[FlatAssembler]

I've tried to speed things up in my PicoBlaze Simulator by adding a checkbox enabling the user to disable updating registers and flags on every step. The "Fibonacci Sequence" example, on my machine, runs in 54 seconds if displaying registers and flags is enabled, and it runs in 27 seconds if they are disabled. That's a significant speed-up, but not as much as 12 times (down to 5 seconds) as Agustin Izaguirre claimed was possible to speed it up by disabling DOM manipulation.