[PATCH] ARM: add support for QBIT

[Saleem Abdulrasool]

Hi t.p.northover, kongyi, rengolin,

Add support for the __ARM_FEATURE_QBIT preprocessor macro.  Also add associated
intrinsics for checking the state of the Q flag.  This is supported on ARMv5
variant 'e' and later CPUs.  These implement section 6.4.6 and 9.1.1 of the
ACLE.

http://reviews.llvm.org/D6107

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