C++ PATCH: two minor constexpr-related fixes

[Jason Merrill]

The first patch: The flags we pass here are eventually passed to 
convert_for_initialization, and we want LOOKUP_COMPLAIN so we get 
errors.  This may only have an effect on the constexpr branch, where we 
use digest_init for literal types, but is correct in any case.

The second patch: the code for comparing CONSTRUCTOR was long obsolete, 
as CONSTRUCTORs aren't expressions anymore.

Tested x86_64-pc-linux-gnu, applied to trunk.
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