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

[Kostya Serebryany]

Changed the patch so that it does not check the field size any more,
but only relies on hasFlexibleArrayMember().
Now the loop iterating over the fields actually knows which element is the last one.
This way we will avoid instrumenting flexible arrays and structs that contain those.

Combined with the David's patch http://reviews.llvm.org/D5478
this will automatically handle cases like
struct S {int Array[0]; }
and
struct S {int Array[1]; }
as well as the cases where S is the last field of another struct.

PTAL

http://reviews.llvm.org/D5924

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