Bug 694885: Avoid stack overflow in ps_run.

The ifelse and if operators require special parsing where we convert
ps function streams to bytecode. If a malformed stream presents
if or ifelse without being preceded by the appropriate { ...} blocks
then throw an error.

This avoids us potentially calling ps_run recursively in an infinite
loop as happens with the test file in this bug.

5f091df77f6600d0927dc36777db2b93_signal_sigabrt_7ffff6d59425_6762_5545.pdf

Thanks to Mateusz Jurczyk and Gynvael Coldwind of the Google Security
Team for providing the fuzzing files.

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