[PATCH] MS ABI: Consider alignment attributes on typedefs for layout

[David Majnemer]

Hi rnk,

The MS ABI has a notion of 'required alignment' for fields; this
alignment supercedes pragma pack directives.

MSVC takes into account alignment attributes on typedefs when
determining whether or not a field has a certain required alignment.

Do the same in clang by tracking whether or not we saw such an attribute
when calculating the type's bitwidth and alignment.

This fixes PR20418.

http://reviews.llvm.org/D4714

Files:
  include/clang/AST/ASTContext.h
  lib/AST/ASTContext.cpp
  lib/AST/RecordLayoutBuilder.cpp
  lib/CodeGen/CGAtomic.cpp
  lib/CodeGen/CGDebugInfo.cpp
  lib/Sema/SemaDeclObjC.cpp
  test/Layout/ms-x86-pack-and-align.cpp
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