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0820266651
Use wrappers around `std::accumulate` to make the code more concise and less bug-prone: https://github.com/llvm/llvm-project/pull/162129. With `std::accumulate`, it's the initial value that determines the accumulator type. `llvm::sum_of` and `llvm::product_of` pick the right accumulator type based on the range element type. Found some funny bugs like a local accumulate helper that calculated a sum with initial value of 1 -- we didn't hit the bug because the code was actually dead...