Assignment typet strong typing and UB fix #864
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The most important part of this patch is the added initialisers in symex_target_equation.h, which fix this warning:
This error was observed in diffblue/platform#520, when cbmc was built using clang's undefined behaviour sanitizer.
Although only the addition on line 209 is strictly required, I've also added initializers for the other primitive data members, because objects should always be in a known state which maintains their invariants once the constructor has finished.
Finally, I changed
assignment_typet
into anenum class
to improve its type-safety and avoid undesired conversions.