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Richard Smith
76576c1387
In general, LLVM's parsing of decimal integers to `APInt`s forms an `APInt` that is 4n bits wide, where n is the length of the integer, and the `isNegative` check only checks the high bit. In this case, we form an `APInt` that is four bits wide, with the high bit set, which we reject because we think it's "negative". These two array lengths are the only ones where this happens -- if the decimal integer value is two characters long, we form an `APInt` that is eight bits wide but holds a value < 100, so the high bit is never set, and the same applies for longer integers too. An `IntegerLiteral` is never negative, so we don't need the `isNegative` check, and in fact it only detects the n=8 and n=9 cases.