Roll out r125794 to help diagnose the llvm-gcc-i386-linux-selfhost failure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125830 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 452f561..fc283a3 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4287,7 +4287,7 @@
                                 N.getResNo(), Offset, dl, SDNodeOrder);
           DAG.AddDbgValue(SDV, N.getNode(), false);
         }
-      } else if (!V->use_empty() ) {
+      } else if (isa<PHINode>(V) && !V->use_empty() ) {
         // Do not call getValue(V) yet, as we don't want to generate code.
         // Remember it for later.
         DanglingDebugInfo DDI(&DI, dl, SDNodeOrder);