[PATCH] Sema: Treat zero sized arrays as flexible array members

[David Majnemer]

Hi rsmith, rnk, andreadb,

Zero sized arrays are more or less the pre-standard version of flexible
array members.  It makes sense to mark structs which contain them as
hasFlexibleArrayMember.

Doing this has the side effect of resolving PR21040, a crash involving
one record inheriting from a base which is terminated with a zero sized
array field.

http://reviews.llvm.org/D5478

Files:
  include/clang/AST/ASTContext.h
  lib/AST/ASTContext.cpp
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaDeclCXX.cpp
  test/Analysis/dtors-in-dtor-cfg-output.cpp
  test/CodeGenObjC/arc-captured-32bit-block-var-layout.m
  test/CodeGenObjC/arc-captured-block-var-layout.m
  test/SemaCXX/flexible-array-test.cpp
  test/SemaCXX/zero-length-arrays.cpp
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