Don't pass SDValues by non-const reference unless they may be
modified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102816 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 19169f6..a38b204 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -3685,7 +3685,8 @@
 bool
 SelectionDAGBuilder::EmitFuncArgumentDbgValue(const DbgValueInst &DI,
                                               const Value *V, MDNode *Variable,
-                                              uint64_t Offset, SDValue &N) {
+                                              uint64_t Offset,
+                                              const SDValue &N) {
   if (!isa<Argument>(V))
     return false;