Expr: Fix maxLitSigned #876
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The maximum signed value needs to start with 8 in hex, so that the most significant byte is `1000`. If it starts with `1`, the byte would be `0001`. This would be a positive number. Moreover, the smallest value should be the largest value plus one. And the largest signed value is `0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff`.
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The maximum signed value needs to start with 8 in hex, so that the most significant byte is
1000. If it starts with1, the byte would be0001. This would be a positive number.Moreover, the smallest value should be the largest value plus one. And the largest signed value is
0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff.Checklist