[PATCH] ARM: sort out MachO target checks

[Tim Northover]

Hi,

This patch is designed so that LLVM can accept the "arm-none-macho" triple and do something sensible with it. As a result, the bulk is sorting out the ARM backend's weird and inconsistent use of the isTargetIOS, isTargetDarwin, isTargetMachO tests, which it previously considered to be basically the same thing.

I also had to choose a set of reasonable defaults for "none-macho", a combination of iOS and ELF behaviour (we want AAPCS, but not RTABI, and some other iOS conventions to hold). I've tried to test most of these in a specific added test, with some explanations.

Could someone look over it and make sure I've not done something stupid?

Cheers.

Tim

http://llvm-reviews.chandlerc.com/D2395

Files:
  lib/Target/ARM/ARMAsmPrinter.cpp
  lib/Target/ARM/ARMAsmPrinter.h
  lib/Target/ARM/ARMBaseRegisterInfo.cpp
  lib/Target/ARM/ARMFastISel.cpp
  lib/Target/ARM/ARMFrameLowering.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrThumb.td
  lib/Target/ARM/ARMInstrThumb2.td
  lib/Target/ARM/ARMSelectionDAGInfo.cpp
  lib/Target/ARM/ARMSubtarget.cpp
  lib/Target/ARM/ARMSubtarget.h
  lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
  lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
  lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
  lib/Target/ARM/Thumb1FrameLowering.cpp
  lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
  lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
  test/CodeGen/ARM/cse-ldrlit.ll
  test/CodeGen/ARM/emit-big-cst.ll
  test/CodeGen/ARM/fast-isel-crash2.ll
  test/CodeGen/ARM/fast-isel-frameaddr.ll
  test/CodeGen/ARM/fold-stack-adjust.ll
  test/CodeGen/ARM/interrupt-attr.ll
  test/CodeGen/ARM/ldm.ll
  test/CodeGen/ARM/memfunc.ll
  test/CodeGen/ARM/none-macho.ll
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