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* Update AIR instruction `intcast` to allow the dest type to be an enum. * LLVM backend: update `intcast` to support when the bit counts of operand and dest type are the same. This was already a requirement of the instruction previously. * Type: `intInfo` supports the case when the type is an enum, and retrieves the info for the integer tag type. This makes it pretty easy for backends to implement `intcast` without having to care explicitly that the new type is an enum. As a bonus, simple enums never have to go through the type system; their signedness and bit count are computed directly. The "int to enum" behavior test case is now passing for stage2 in the LLVM backend.