[test/Prototypes] Fix DoubleWidth think-o that trips an assert #69442
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If
lhsandrhshave the same number of leading zero bits (and we knowrhs < lhs), then we can't call_divideto divide a triple-width magnitude by a double-width magnitude (this trips the assert on line 598), but rather we know that the quotient is one. Additionally, we must use>>instead of&>>when computing the high word because in this scenario the leading zero bits may be zero.Resolves apple/swift-numerics#272