[PATCH] Add experimental clang/driver flag -fsanitize-address-field-padding=N

[Kostya Serebryany]

I actually wanted to commit this separately to disentangle
the review process. It may actually require some additional changes in flags.

http://reviews.llvm.org/D5676

Files:
  include/clang/Basic/LangOptions.h
  include/clang/Driver/Options.td
  include/clang/Driver/SanitizerArgs.h
  lib/Driver/SanitizerArgs.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/Driver/fsanitize.c
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