[PATCH] [Multiprecision Arithmetic Optimization] Teach SelectionDAG how to promote the integer carry result of {add, sub}{c, e} to a larger integer type.

[Sean Silva]

+  SDValue Ops[3] = { N->getOperand(0), N->getOperand(1) };

Having an array of size 3 with only two initializers seems confusing in the
sense that when I see this I think to myself "is this intentional, or is it
a bug?". Don't make the reader guess whether this is a bug and instead
explicitly list out 3 entries.

-- Sean Silva
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