UFs + FPA -> internalizer doesn't respect memory limit

[nunoplopes]

Z3 ignores the memory limit for the attached file. I had to kill it after 8 GBs of memory usage, while the limit is only 2 GBs.

$ z3 memory_high_watermark=2147483648 crash.smt2

The trace is super deep and it's all about the internalizer (is it going on an infinite loop?):

#192 smt::context::internalize_ite_term(app*)
#193 smt::context::internalize_ite_term(app*)
#194 smt::context::internalize_formula_core(app*, bool)
#195 smt::context::internalize_eq(app*, bool)
#196 smt::context::internalize_formula_core(app*, bool)
#197 smt::context::internalize_formula_core(app*, bool)
#198 smt::theory_fpa::assert_cnstr(expr*)
#199 smt::theory_fpa::internalize_atom(app*, bool)
#200 smt::context::internalize_theory_atom(app*, bool)
#201 smt::context::internalize_formula(expr*, bool)
#202 smt::context::assert_default(expr*, app*)
#203 smt::context::internalize_assertion(expr*, app*, unsigned int)
#204 smt::context::internalize_assertions()
#205 smt::context::setup_and_check(bool)

(Upstream report: AliveToolkit/alive2#785)

[nunoplopes]

Seems fixed, thank you!
Benchmarking it now to check if it regresses smth.