[PATCH] Microsoft C++ Record Layout

[Warren Hunt]

  To replay about the changes to ms_class_layout.  It's a bit odd to talk about DataSize in MS land because DataSize is a term defined in the Itanium layout algorithm and doesn't necessary apply.  I did what I think it most similar.  The Itanium ABI does not modify dsize after laying out fields so virtual bases aren't included.  The existing tests assert that size and dsize should be the same in these tests but that is clearly wrong given that these classes have virtual bases, so the non-virtual size and data size should be smaller than the size.

http://llvm-reviews.chandlerc.com/D1026