Benchmark: division with/out single digit arithmetic

[oscbyspro]

I measured the difference of using Plus1 and DoubleWidth arithmetic during division. I expected it to be small, but it is huge.

1. with single digit arithmetic

Test Case '-[ANKFullWidthKitBenchmarks. Int256BenchmarksOnDivision testDividingFullWidth]' passed (0.094 seconds).
Test Case '-[ANKFullWidthKitBenchmarks.UInt256BenchmarksOnDivision testDividingFullWidth]' passed (0.084 seconds).

2. without single digit arithmetic

Test Case '-[ANKFullWidthKitBenchmarks. Int256BenchmarksOnDivision testDividingFullWidth]' passed (0.482 seconds).
Test Case '-[ANKFullWidthKitBenchmarks.UInt256BenchmarksOnDivision testDividingFullWidth]' passed (0.467 seconds).

AwesomeNumbersKit/Sources/ANKFullWidthKit/ANKFullWidth+Division.swift

Line 119 in 4e141eb

@inlinable func _quotientAndRemainderReportingOverflowAsUnsigned(dividingBy divisor: Self) -> PVO<QR<Self, Self>> {