Print PseudoSourceValue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55291 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 00987d7..41df5df 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -756,8 +756,8 @@
         OS << "<unknown>";
       else if (!V->getName().empty())
         OS << V->getName();
-      else if (isa<PseudoSourceValue>(V))
-        OS << *V;
+      else if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V))
+        OS << *PSV;
       else
         OS << V;