If a function is vararg, never pass inreg arguments in registers.  Thanks to
Anton for half of this patch.

llvm-svn: 37641
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index edf4294..7028c9e 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -1830,7 +1830,8 @@
 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG, TargetMachine &TM) {
   SmallVector<CCValAssign, 16> RVLocs;
   unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
-  CCState CCInfo(CC, TM, RVLocs);
+  bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
+  CCState CCInfo(CC, isVarArg, TM, RVLocs);
   CCInfo.AnalyzeReturn(Op.Val, RetCC_PPC);
   
   // If this is the first return lowered for this function, add the regs to the