...to complement and improve upon GCC's -Wclass-memaccess.  See the comment at
the head of compilerplugins/clang/classmemaccess.cxx for details.  (It is not
yet clear to me whether we would want to get this upstreamed into Clang.)

35d21e4bf6f66b3bbc7a44fcf184cb721b524a94 "Remove redundant memsets" was a case
that benefited from looking through toplevel casts to void*.  (Though the code
in include/basic/sbxvar.hxx needs a slightly more verbose way to deliberately
silence the warning now.)

d03041e19215592f21ba1222d3cfa29e1f94260a "Drop bogus memsets" is one example of
various cases that GCC -Wclass-memaccess failed to catch due to the use of array
instead of pointer types.

Change-Id: I6a9bfc34e3536834af35fdf4fb7ceeb31f31f8c0
Reviewed-on: https://gerrit.libreoffice.org/80421
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>