Add an operator for vdup_lane so it can be implemented without a clang builtin.

llvm-svn: 121190
diff --git a/llvm/utils/TableGen/NeonEmitter.cpp b/llvm/utils/TableGen/NeonEmitter.cpp
index d3a0680..9b38b5e 100644
--- a/llvm/utils/TableGen/NeonEmitter.cpp
+++ b/llvm/utils/TableGen/NeonEmitter.cpp
@@ -680,6 +680,9 @@
   case OpDup:
     s += Duplicate(nElts, typestr, "__a") + ";";
     break;
+  case OpDupLane:
+    s += SplatLane(nElts, "__a", "__b") + ";";
+    break;
   case OpSelect:
     // ((0 & 1) | (~0 & 2))
     s += "(" + ts + ")";