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invalid pointer pairs are when the length/memory of one string are intermixed with another. For comp_err, the end null pointer was compared to soffset within my_strtoll10. As we didn't need the end position a NULL arg option was compatble. For uca-dump, Address Sanitizer raises invalid pointer pair because argv options (opt) don't have an obvious correlation of having a start at opt_X.length, even though the lstrncmp makes this true. The DBUG_ASSERTS of strmov (added MDEV-11752) where incompatible with pointer-compare. Replaced strmov with static inline version in m_string.h using memmove that allows overlaps, and being inline allows the uneeded parts of the implementation to be optimized away.