tests/run/bridges.scala cannot be compiled by clean compiler

[nicolasstucki]

It can be reproduced with:
vulpix tests/run/bridges.scala

but not with
vulpix

[nicolasstucki]

This has been happening since it was added in 92fe2a5

[nicolasstucki]

There is probably some state left from previous runs in the compiler that allows it to work.

[smarter]

No idea why it doesn't break usually, but bridges.scala contains a block with 1424 statements which causes withDefinedSyms to blow up with a stackoverflow because foldRightBN is not tail-recursive. This should be easy to fix by replacing foldRightBN by a while loop. But someone should investigate why this doesn't trigger when running all the tests, maybe vulpix forgets to run bridges.scala for some reason?

[DarkDimius]

@smarter @nicolasstucki VM needs different amount of stack in JITed and interpreted mode.
You can have code that does not stackoverflow when compiled but does when interpreted.