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b01d6b156c
This instruction is like `intcast`, but includes two safety checks: * Checks that the int is in range of the destination type * If the destination type is an exhaustive enum, checks that the int is a named enum value This instruction is locked behind the `safety_checked_instructions` backend feature; if unsupported, Sema will emit a fallback, as with other safety-checked instructions. This instruction is used to add a missing safety check for `@enumFromInt` truncating bits. This check also has a fallback for backends which do not yet support `safety_checked_instructions`. Resolves: #21946