In this patch I am adding the missing target hooks required for the
liveness analysis to run on AArch64. These are
- getFlagsReg()
- getRegsUsedAsParams()
- getDefaultLiveOut()
- getGPRegs()
- isCleanRegXOR()
I am also introducing the following API in LivenessAnalysis
- BitVector getLiveIn/Out(const MCInst &)
- MCPhysReg scavengeRegFromState(BitVector &)
My intention is to allow the LongJmp pass scavenge usable registers when
injecting code.
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