[llvm] fixed issue with llvm 5 vs 6 (#1167)

src/codegen/llvm/codegen_amdgpu.cc

@@ -200,8 +200,13 @@ runtime::Module BuildAMDGPU(Array<LoweredFunc> funcs, std::string target) {
   dest_ll.SetUnbuffered();
   destAsm.SetUnbuffered();
   module->print(dest_ll, nullptr);
+#if TVM_LLVM_VERSION <= 60
   std::unique_ptr<llvm::Module> mAsm = llvm::CloneModule(module.get());
   std::unique_ptr<llvm::Module> mObj = llvm::CloneModule(module.get());
+#else
+  std::unique_ptr<llvm::Module> mAsm = llvm::CloneModule(*module.get());
+  std::unique_ptr<llvm::Module> mObj = llvm::CloneModule(*module.get());
+#endif
   llvm::legacy::PassManager pass;
 
   CHECK(tm->addPassesToEmitFile(