Clamp an overflow to the largest finite value in the add tests - #1
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- IEEE 754-2019 7.4: an overflow clamps to the largest finite value in the toward zero mode, and in the directed mode which points at zero for the sign. - The 4 ddAdd cases had an infinity override. Boost.Decimal now clamps, so the original expected values apply again. Ref boostorg/decimal#1460
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Ref: boostorg/decimal#1460