Daniel Black d3afdd162b
MDEV-35738 mariadb build -fsanitize=pointer-compare ...
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.
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