[patch] Make emitCXXStructor an CGCXXABI method

[Rafael Espíndola]

The first attached patch creates a emitCXXStructor function and makes
the existing emitCXXConstructor and emitCXXDestructor static helpers.

The next patch makes it be a method of CGCXXABI. For now with
identical implementations in Itanium and Microsoft.

The objective is that in subsequent patches we can

* Simplify each implementation a bit.
* Change the Itanium one to use comdats being sure the Microsoft one
  is not changed.

Cheers,
Rafael
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