EricWF added a comment.

In https://reviews.llvm.org/D28785#650101, @compnerd wrote:

> While I love this direction (the original version really was an 
> unintelligible pile of code), I really think that this change may be taking 
> on too much.  Why not split it up first and do nothing else.  We could do the 
> MS ABI implementation in a subsequent change.  This would improve the code 
> and would not be gated on the MS ABI changes.


I agree this review is taking on too much, it started out much smaller and I 
tried to avoid expanding it, but in the end I had three options:

A) Regress and remove all support for MSVC, this would break the windows build. 
(at least in `exception.cpp` and `new.cpp`).
B) Implement incorrect versions of `support/runtime/<header>_msvc.ipp`  based 
on w/e we currently have, just to keep Windows building.
C) Implement correct versions of `support/runtime/<header>_msvc.ipp`.

I choose (C) since I didn't want to regress Windows, or spend time implementing 
incorrect `<header>_msvc.ipp` versions.
However I'm willing to try and shrink this down if you think that would be 
better.


https://reviews.llvm.org/D28785



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