C++ PATCH for c++/41449 (EH cleanup of partially-aggregate-initialized objects)

[Jason Merrill]

The C++ standard says that if an exception is thrown during 
initialization of a class, any fully-constructed subobjects are 
destroyed.  We already handled that properly for objects initialized via 
constructor, but we weren't handling it properly for aggregate 
initialization.  This patch adds the necessary EH cleanups for during 
initialization; conveniently, just using push_eh_cleanup works here 
because we were already doing push/pop_stmt_list around the 
initialization as a whole.

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