Fixed masked gather/scatter switch-case

llvm-svn: 236092
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 8a0043b..08bdccd 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4385,11 +4385,13 @@
 
   case Intrinsic::masked_gather:
     visitMaskedGather(I);
+    return nullptr;
   case Intrinsic::masked_load:
     visitMaskedLoad(I);
     return nullptr;
   case Intrinsic::masked_scatter:
     visitMaskedScatter(I);
+    return nullptr;
   case Intrinsic::masked_store:
     visitMaskedStore(I);
     return nullptr;