Add an implementation of the CanLowerReturn function to the PPC backend

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141981 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h
index 5f825bd..430e45e 100644
--- a/lib/Target/PowerPC/PPCISelLowering.h
+++ b/lib/Target/PowerPC/PPCISelLowering.h
@@ -445,6 +445,12 @@
                 DebugLoc dl, SelectionDAG &DAG,
                 SmallVectorImpl<SDValue> &InVals) const;
 
+    virtual bool
+      CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
+                   bool isVarArg,
+                   const SmallVectorImpl<ISD::OutputArg> &Outs,
+                   LLVMContext &Context) const;
+
     virtual SDValue
       LowerReturn(SDValue Chain,
                   CallingConv::ID CallConv, bool isVarArg,