guard abi breaking changes

Author: reble

sycl/include/sycl/handler.hpp

@@ -2824,10 +2824,15 @@ class __SYCL_EXPORT handler {
   /// Executes a command_graph.
   ///
   /// \param Graph Executable command_graph to run
+#ifdef __INTEL_PREVIEW_BREAKING_CHANGES
   void
   ext_oneapi_graph(const ext::oneapi::experimental::command_graph<
                    ext::oneapi::experimental::graph_state::executable> &Graph);
-
+#else
+  void ext_oneapi_graph(ext::oneapi::experimental::command_graph<
+                        ext::oneapi::experimental::graph_state::executable>
+                            Graph);
+#endif
   /// Copies data from host to device, where \p Src is a USM pointer and \p Dest
   /// is an opaque image memory handle. An exception is thrown if either \p Src
   /// is nullptr or \p Dest is incomplete. The behavior is undefined if

sycl/source/handler.cpp

@@ -2323,8 +2323,15 @@ void handler::setKernelWorkGroupMem(size_t Size) {
 }
 
 void handler::ext_oneapi_graph(
+#ifndef __INTEL_PREVIEW_BREAKING_CHANGES
+    ext::oneapi::experimental::command_graph<
+        ext::oneapi::experimental::graph_state::executable>
+        Graph
+#else
     const ext::oneapi::experimental::command_graph<
-        ext::oneapi::experimental::graph_state::executable> &Graph) {
+        ext::oneapi::experimental::graph_state::executable> &Graph
+#endif
+) {
   setType(detail::CGType::ExecCommandBuffer);
   impl->MExecGraph = detail::getSyclObjImpl(Graph).get();
 }