[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]

My concerns are addressed. Looks very clean.

Tiny nit: clang-format suggests a space before `?` in:

+  SDValue Op2 = NumOperands == 3? N->getOperand(2) : SDValue();

-- Sean Silva
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