[Hexagon] Remove unused declaration SelectZeroExtend (NFC)

The corresponding definition was removed on Jan 23, 2018 in commit
3780a0e1fae463e9195ae3fc2ba8424608310d8a.

diff --git a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.h b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.h
index 1e50385..505c90f 100644 (file)
--- a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.h
+++ b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.h
@@ -95,7 +95,6 @@ public:
   void SelectIndexedStore(StoreSDNode *ST, const SDLoc &dl);
   void SelectStore(SDNode *N);
   void SelectSHL(SDNode *N);
-  void SelectZeroExtend(SDNode *N);
   void SelectIntrinsicWChain(SDNode *N);
   void SelectIntrinsicWOChain(SDNode *N);
   void SelectConstant(SDNode *N);