[patch] Make emitCXXStructor an CGCXXABI method

[Rafael Espíndola]

> Any reason not to attempt to add more simplifications to the second patch?
> We have duplicate code like this:

Oh, I just wanted to do it in another patch. Both attached. A 3rd one
will then change the Itanium one to use COMDATs.

Cheers,
Rafael
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