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MDEV-33534 UBSAN: Negation of -X cannot be represented in type 'long …
…long int'; cast to an unsigned type to negate this value to itself in my_double_round from sql/item_func.cc| The negation in this line: ulonglong abs_dec= dec_negative ? -dec : dec; did not take into account that 'dec' can be the smallest possible signed negative value -9223372036854775808. Its negation is an operation with an undefined behavior. Fixing the code to use Longlong_hybrid, which implements a safe method to get an absolute value.
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