c++: structural_comptypes addition

[Nathan Sidwell]

I had to debug structural_comptypes, and its complex if conditions and 
tail calling of same_type_p made that hard.  I'd hope we can turn the 
eqivalent of return boolean_fn () ? true : false; into a tail call of 
the boolean.  We also were not dealing with TYPEOF_TYPE.

             gcc/cp/
             * typeck.c (structural_comptypes): [DECLTYPE_TYPE] break
             apart complex if.
             [UNDERLYING_TYPE]: Use an if.
             [TYPEOF_TYPE]: New.

nathan
-- 
Nathan Sidwell
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