CastKind:
| "Truncate"
| "SignExtend"
| "ZeroExtend"
| "FloatExtend"
| "FloatTruncate"
| "SignedIntToFloat"
| "UnsignedIntToFloat"
| "FloatToSignedInt"
| "FloatToUnsignedInt"
| "ReinterpretBits"
| "Bitcast"
| "Reshape"
| "ArrayToPointer"
| "PointerToInt"
| "IntToPointer"