Better support for constructors with -cxx-abi microsoft

[Timur Iskhodzhanov]

Hi John,

Attached is a preliminary patch for ctors in -cxx-abi microsoft.

It adds:
- support for out-of-class constructor definitions (PR12784),
- reading and writing proper ctor arguments when dealing with virtual bases.
I also tried this patch on some "build, run and verify" tests for
virtual inheritance vs ctors and it works great.

Can you please take a look at the implementation and tell me if there
are any logical mistakes?

Also, I've put two TODOs in the code with questions.
It would be nice if you could take a look at the logic first and
suggest me if my CGCXXABI abstraction plans are sane - before I copy
any code between files.

If the logic of the patch and the abstraction suggestions are fine,
I'll move the code around as described and prepare a patch ready for
review.

Thanks!
--
Timur
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