guard invalid _FloatN width in ParseBuiltinType - #2128
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the _FloatN branch of ParseBuiltinType passed the parsed width straight to MaybeAppendDecimal, so a crafted symbol with a negative or overflowed width like
_ZNK1ScvDFn3_Evprinted punctuation bytes in place of digits; guard it with the samenumber >= 0else?check the sibling _BitInt branch right above already uses.