[PATCH] D21865: LivePhysRegs: Add available() function.

[Matthias Braun via llvm-commits]

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findScratchNonCalleeSaveRegister() just needs a simple liveness
analysis, use LivePhysRegs for that as it is simpler and does not depend
on the kill flags. This is part of an initiative to rely less on kill flags.

This commit adds a convenience function available() to LivePhysRegs:
This function returns true if the given register is not reserved and
neither the register nor any of its aliases are alive.

Repository:
  rL LLVM

http://reviews.llvm.org/D21865

Files:
  include/llvm/CodeGen/LivePhysRegs.h
  lib/CodeGen/LivePhysRegs.cpp
  lib/Target/AArch64/AArch64FrameLowering.cpp

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