[PATCH] Add tail call optimization for thumb1-only targets rev. 3

[Bjoern Haase]

Added check for use of R12 in register scavenging. Try to fall-back to LR in case that R12 is used in the basic block where the emergency condition occurs.


http://reviews.llvm.org/D7005

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMSubtarget.cpp
  lib/Target/ARM/Thumb1FrameLowering.cpp
  lib/Target/ARM/Thumb1RegisterInfo.cpp
  test/CodeGen/ARM/fourParametersTailCall_v6m.ll
  test/CodeGen/ARM/threeParametersTailCall_v6m.ll
  test/CodeGen/ARM/twoParametersTailCall_v6m.ll

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