We ignored the cast if the enum was scoped.
This is bad since there is no implicit conversion from the scoped enum to the corresponding underlying type.
The fix is basically: isIntegralOrEnumerationType() -> isIntegralOr**Unscoped**EnumerationType()
This materialized in crashes on analyzing the LLVM itself using the Z3 refutation.
Refutation synthesized the given Z3 Binary expression (BO_And of unsigned char aka. 8bits and an int 32 bits) with the wrong bitwidth in the end, which triggered an assert.
Now, we evaluate the cast according to the standard.
This bug could have been triggered using the Z3 CM according to https://bugs.llvm.org/show_bug.cgi?id=44030