[PATCH] Do not insert asan paddings after fields that have flexible arrays.

[Kostya Serebryany]

Hi majnemer, rsmith,

We should avoid a tail padding not only if the last field
has zero size but also if the last field is a struct with a flexible array.

If/when http://reviews.llvm.org/D5478 is committed,
this will also handle the case of structs with zero-sized arrays.

http://reviews.llvm.org/D5924

Files:
  lib/AST/RecordLayoutBuilder.cpp
  test/CodeGen/sanitize-address-field-padding.cpp
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