shared: add MAXSIZE() and use it in resolved

The MAXSIZE() macro takes two types and returns the size of the larger
one. It is much simpler to use than MAX(sizeof(A), sizeof(B)) and also
avoids any compiler-extensions, unlike CONST_MAX() and MAX() (which are
needed to avoid evaluating arguments more than once). This was suggested
by Daniele Nicolodi <daniele@grinta.net>.

Also make resolved use this macro instead of CONST_MAX(). This enhances
readability quite a bit.

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