[SYCL] Don't export print_graph(std::string, bool) under -fpreview_breaking_changes (#16390)

Follow-up for #16194. We must keep
exporting it for backward ABI compatibility by default, but that isn't
necessary for the next major release (which `-fpreview_breaking_changes`
covers).

Author: aelovikov-intel

sycl/include/sycl/ext/oneapi/experimental/graph.hpp

@@ -340,7 +340,13 @@ class __SYCL_EXPORT modifiable_command_graph
   /// @param path The path to write the DOT file to.
   /// @param verbose If true, print additional information about the nodes such
   /// as kernel args or memory access where applicable.
+#ifdef ___INTEL_PREVIEW_BREAKING_CHANGES
+  void print_graph(const std::string path, bool verbose = false) const {
+    print_graph(sycl::detail::string_view{path}, verbose);
+  }
+#else
   void print_graph(const std::string path, bool verbose = false) const;
+#endif
 
   /// Get a list of all nodes contained in this graph.
   std::vector<node> get_nodes() const;
@@ -387,6 +393,7 @@ class __SYCL_EXPORT modifiable_command_graph
   std::shared_ptr<detail::graph_impl> impl;
 };
 
+#ifndef ___INTEL_PREVIEW_BREAKING_CHANGES
 #ifdef __SYCL_GRAPH_IMPL_CPP
 // Magic combination found by trial and error:
 __SYCL_EXPORT
@@ -401,6 +408,7 @@ inline
                                           bool verbose) const {
   print_graph(sycl::detail::string_view{path}, verbose);
 }
+#endif
 
 // Templateless executable command-graph base class.
 class __SYCL_EXPORT executable_command_graph