implement __builtin_return_addr(0) on ppc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44700 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h
index 2df750d..3d3d38f 100644
--- a/lib/Target/PowerPC/PPCISelLowering.h
+++ b/lib/Target/PowerPC/PPCISelLowering.h
@@ -288,6 +288,7 @@
     /// the offset of the target addressing mode.
     virtual bool isLegalAddressImmediate(GlobalValue *GV) const;
 
+    SDOperand LowerRETURNADDR(SDOperand Op, SelectionDAG &DAG);
     SDOperand LowerFRAMEADDR(SDOperand Op, SelectionDAG &DAG);
   };
 }