Adds a MPS b, scaled by the scalar prefactor s to the MPS a, essentially a fused-multiply-add for MPS::State.
References syten::expansion(), syten::genCombinator(), syten::MPS::State::lIdx, syten::MPS::State::lInt, syten::MPS::State::maybeCache(), syten::MPS::State::rIdx, syten::MPS::State::rInt, syten::MPS::State::size(), SYTEN_ASSERT_DEBUG, and syten::MPS::State::uInt.
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