DAG: Handle atomic fsub in node dumper

Author: arsenm

llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp

@@ -97,6 +97,7 @@ std::string SDNode::getOperationName(const SelectionDAG *G) const {
   case ISD::ATOMIC_LOAD_UMIN:           return "AtomicLoadUMin";
   case ISD::ATOMIC_LOAD_UMAX:           return "AtomicLoadUMax";
   case ISD::ATOMIC_LOAD_FADD:           return "AtomicLoadFAdd";
+  case ISD::ATOMIC_LOAD_FSUB:           return "AtomicLoadFSub";
   case ISD::ATOMIC_LOAD_FMIN:           return "AtomicLoadFMin";
   case ISD::ATOMIC_LOAD_FMAX:           return "AtomicLoadFMax";
   case ISD::ATOMIC_LOAD_UINC_WRAP: