Fix negation of immediates in ccmp, ccmn and neg #99
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In two's-complement representation, the negation of the minimum value of a signed type can't be represented. Detect and elide inversion for these cases in ccmp, ccmn and neg.
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In two's-complement representation, the negation of the minimum value of a signed type can't be represented. Detect and elide inversion for these cases in ccmp, ccmn and neg.