[9.20] fix: dev: CID 498025 and CID 498031: Overflowed constant INTEGER_OVERFLOW
requested to merge backport-4798-cid-498025-and-cid-498031-overflowed-constant-integer_overflow-9.20 into bind-9.20
Add INSIST to fail if the multiplication would cause the variables to overflow.
Closes #4798 (closed)
Backport of MR !9131 (merged)