[PATCH] [x32] Add __ILP32__ macro for ILP32 platforms

[Pavel Chupin]

Hi chandlerc, atanasyan,

Add __ILP32__ and _ILP32 macro for corresponding platforms.
Cover x86_64-*-*-gnux32 with test.

http://reviews.llvm.org/D4473

Files:
  lib/Frontend/InitPreprocessor.cpp
  test/Preprocessor/init.c
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