[SDAG] Fix release build

This variable was only declared in debug builds, but is needed
in release builds as well.

llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp

@@ -1226,12 +1226,12 @@ void SelectionDAGBuilder::visitGCResult(const GCResultInst &CI) {
 }
 
 void SelectionDAGBuilder::visitGCRelocate(const GCRelocateInst &Relocate) {
+  const Value *Statepoint = Relocate.getStatepoint();
 #ifndef NDEBUG
   // Consistency check
   // We skip this check for relocates not in the same basic block as their
   // statepoint. It would be too expensive to preserve validation info through
   // different basic blocks.
-  const Value *Statepoint = Relocate.getStatepoint();
   assert((isa<GCStatepointInst>(Statepoint) || isa<UndefValue>(Statepoint)) &&
          "GetStatepoint must return one of two types");
   if (isa<UndefValue>(Statepoint))