[PATCH] Fixing Alias-Avoidance Padding for MS-ABI Layout

[Warren Hunt]

Hi majnemer, rsmith,

This patch adds appropriate padding to mimic the way that the MS-ABI attempts to avoid aliasing among 0 sized bases.

This require adding two additional bits of state to be tracked, but fortunately allows us to remove some other tracked state.

Also I went ahead and deleted the misaligned int64 code (it's been dead for a while, that case is covered by the existing ms-bitfields code).

http://llvm-reviews.chandlerc.com/D2258

Files:
  include/clang/AST/RecordLayout.h
  lib/AST/RecordLayout.cpp
  lib/AST/RecordLayoutBuilder.cpp
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