Fix -Asserts warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@87024 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp
index 53a7ea2..58af9c5 100644
--- a/lib/CodeGen/PHIElimination.cpp
+++ b/lib/CodeGen/PHIElimination.cpp
@@ -443,10 +443,9 @@
   MachineFunction *MF = A->getParent();
   MachineBasicBlock *NMBB = MF->CreateMachineBasicBlock(BB);
   MF->push_back(NMBB);
-  const unsigned NewNum = NMBB->getNumber();
   DEBUG(errs() << "PHIElimination splitting critical edge:"
         " BB#" << A->getNumber()
-        << " -- BB#" << NewNum
+        << " -- BB#" << NMBB->getNumber()
         << " -- BB#" << B->getNumber() << '\n');
 
   A->ReplaceUsesOfBlockWith(B, NMBB);