[AArch64] Add lowering of llvm.frameaddress and llvm.returnaddress

[Weiming Zhao]

Hi,

 

Attached patch fixes PR17690: http://llvm.org/bugs/show_bug.cgi?id=17690 by
add lowering of FRAMEADDR and RETURNADDR.

 

Please help to review it. 

 

Thanks,

Weiming

 

Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by
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