[PATCH] Preprocessor: improve ACLE 6.4 support

[Saleem Abdulrasool]

Hi t.p.northover, joey,

This improves conformance with ACLE 6.4.1.  Define additional macros that
indicate support for the ARM and Thumb instruction set architecture.  This
includes the following set of macros:

  __ARM_ARCH
  __ARM_ARCH_ISA_ARM
  __ARM_ARCH_ISA_THUMB
  __ARM_32BIT_STATE

These help identify the environment that the code is intended to execute on.

http://reviews.llvm.org/D4146

Files:
  lib/Basic/Targets.cpp
  test/Preprocessor/arm-acle-6.4.c
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