[DAGCombiner] Added BSWAP vector constant folding support.

llvm-svn: 239675
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index cf51e75..27fa3d2 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2932,6 +2932,7 @@
       case ISD::TRUNCATE:
       case ISD::UINT_TO_FP:
       case ISD::SINT_TO_FP:
+      case ISD::BSWAP:
       case ISD::CTLZ:
       case ISD::CTLZ_ZERO_UNDEF:
       case ISD::CTTZ: