[PATCH] Microsoft Layout - Empty non-virtual base after base with vbptr

[Warren Hunt]

Hi majnemer, rsmith,

Microsoft adds an extra byte of padding before laying out zero sized non-virtual bases if the non-virtual base before it contains a vbptr.

Addresses:
http://llvm.org/bugs/show_bug.cgi?id=17750

http://llvm-reviews.chandlerc.com/D2106

Files:
  lib/AST/RecordLayoutBuilder.cpp
  test/Layout/ms-x86-shared-vb-lazy-empty-nonvirtual-base.cpp
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