C++ PATCH for c++/55753 (ICE with constexpr)

[Jason Merrill]

And another bug: we were building an AGGR_INIT_EXPR in non-dependent 
code, and then failing to handle it properly in fold_non_dependent_expr. 
  Fixed by not creating AGGR_INIT_EXPR in templates.  As a result, we 
end up with a CALL_EXPR to the address of a constructor, and we need to 
avoid an error when instantiating that by stripping the address and 
letting the call code put it back.

Tested x86_64-pc-linux-gnu, applying to trunk.  This is only an ICE with 
checking enabled, so I'm not going to apply it to 4.7.

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