[SYCL][Graph] Export missing graph node symbols (intel#13744)

The symbols for templated methods `node::update_range()` and
`node::update_nd_range()` were not having their symbols exported on
Windows DLLs. Leading to link errors when running clang in the Graph E2E
tests `Update/update_nd_range.cpp` and `Update/update_range.cpp`

Fixed by adding `__SYCL_EXPORT` to the templated specializations are
recommended by the [__SYCL_EXPORT Macro
documentation](https://intel.github.io/llvm-docs/developer/ABIPolicyGuide.html#sycl-export-macro)

Also removed duplicate forward declaration of `command_graph` from
`graph.hpp`. It is already forward declared earlier on in the file on
line 43.

Author: EwanC

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

@@ -206,8 +206,6 @@ class depends_on_all_leaves : public ::sycl::detail::DataLessProperty<
 } // namespace node
 } // namespace property
 
-template <graph_state State> class command_graph;
-
 namespace detail {
 // Templateless modifiable command-graph base class.
 class __SYCL_EXPORT modifiable_command_graph {

sycl/source/detail/graph_impl.cpp

@@ -1699,22 +1699,22 @@ node node::get_node_from_event(event nodeEvent) {
       GraphImpl->getNodeForEvent(EventImpl));
 }
 
-template <> void node::update_nd_range<1>(nd_range<1> NDRange) {
+template <> __SYCL_EXPORT void node::update_nd_range<1>(nd_range<1> NDRange) {
   impl->updateNDRange(NDRange);
 }
-template <> void node::update_nd_range<2>(nd_range<2> NDRange) {
+template <> __SYCL_EXPORT void node::update_nd_range<2>(nd_range<2> NDRange) {
   impl->updateNDRange(NDRange);
 }
-template <> void node::update_nd_range<3>(nd_range<3> NDRange) {
+template <> __SYCL_EXPORT void node::update_nd_range<3>(nd_range<3> NDRange) {
   impl->updateNDRange(NDRange);
 }
-template <> void node::update_range<1>(range<1> Range) {
+template <> __SYCL_EXPORT void node::update_range<1>(range<1> Range) {
   impl->updateRange(Range);
 }
-template <> void node::update_range<2>(range<2> Range) {
+template <> __SYCL_EXPORT void node::update_range<2>(range<2> Range) {
   impl->updateRange(Range);
 }
-template <> void node::update_range<3>(range<3> Range) {
+template <> __SYCL_EXPORT void node::update_range<3>(range<3> Range) {
   impl->updateRange(Range);
 }
 } // namespace experimental

sycl/test/abi/sycl_symbols_windows.dump

@@ -4341,6 +4341,12 @@
 ?get_mip_level_mem_handle@image_mem@experimental@oneapi@ext@_V1@sycl@@QEBA?AUimage_mem_handle@23456@I@Z
 ?get_name@kernel_id@_V1@sycl@@QEBAPEBDXZ
 ?get_node_from_event@node@experimental@oneapi@ext@_V1@sycl@@SA?AV123456@Vevent@56@@Z
+??$update_nd_range@$00@node@experimental@oneapi@ext@_V1@sycl@@QEAAXV?$nd_range@$00@45@@Z
+??$update_nd_range@$01@node@experimental@oneapi@ext@_V1@sycl@@QEAAXV?$nd_range@$01@45@@Z
+??$update_nd_range@$02@node@experimental@oneapi@ext@_V1@sycl@@QEAAXV?$nd_range@$02@45@@Z
+??$update_range@$00@node@experimental@oneapi@ext@_V1@sycl@@QEAAXV?$range@$00@45@@Z
+??$update_range@$01@node@experimental@oneapi@ext@_V1@sycl@@QEAAXV?$range@$01@45@@Z
+??$update_range@$02@node@experimental@oneapi@ext@_V1@sycl@@QEAAXV?$range@$02@45@@Z
 ?get_nodes@modifiable_command_graph@detail@experimental@oneapi@ext@_V1@sycl@@QEBA?AV?$vector@Vnode@experimental@oneapi@ext@_V1@sycl@@V?$allocator@Vnode@experimental@oneapi@ext@_V1@sycl@@@std@@@std@@XZ
 ?get_num_channels@image_mem@experimental@oneapi@ext@_V1@sycl@@QEBAIXZ
 ?get_pipe_name@pipe_base@experimental@intel@ext@_V1@sycl@@KA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PEBX@Z