[PATCH] Use function attribute "arm-restrict-it"

[Akira Hatanaka]

Hi echristo, dexonsmith,

This patch changes ARMSubtarget::restrictIT to use the function attribute "arm-restrict-it" to decide whether ARMv7 or v8 style IT blocks should be generated.

IThe corresponding clang patch is here: http://reviews.llvm.org/D10414

http://reviews.llvm.org/D10416

Files:
  lib/Target/ARM/ARMBaseInstrInfo.cpp
  lib/Target/ARM/ARMSubtarget.cpp
  lib/Target/ARM/ARMSubtarget.h
  lib/Target/ARM/ARMTargetMachine.cpp
  lib/Target/ARM/Thumb2ITBlockPass.cpp
  test/CodeGen/Thumb2/restict-it-fnattr.ll

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