Fix UB

[EllipticEllipsis]

Goal: get a whole project to compile with ASAN on

Currently known UB:

• [x] wrapper___ll_mul will cause UB if multiplicands are too large (known to occur in cfe). Proposed solution: cast the multiplicands to unsigned first.
• [x] wrapper___ll_lshift will cause UB if shift is too large (occurs in OoT z_en_ossan.c)

[hensldm]

Fixed in #31