[SYCL][HIP] Add missing piProgramLink stub (#4933)

This entry point is not supported at the moment so it will just assert.
However that is more informative than the segfaulst caused by having the
entry point missing altogether.

Author: npmiller

sycl/plugins/hip/pi_hip.cpp

@@ -2936,6 +2936,18 @@ pi_result hip_piProgramGetInfo(pi_program program, pi_program_info param_name,
   return {};
 }
 
+pi_result hip_piProgramLink(pi_context context, pi_uint32 num_devices,
+                            const pi_device *device_list, const char *options,
+                            pi_uint32 num_input_programs,
+                            const pi_program *input_programs,
+                            void (*pfn_notify)(pi_program program,
+                                               void *user_data),
+                            void *user_data, pi_program *ret_program) {
+  cl::sycl::detail::pi::die(
+      "hip_piProgramLink: linking not supported with hip backend");
+  return {};
+}
+
 /// Creates a new program that is the outcome of the compilation of the headers
 ///  and the program.
 /// \TODO Implement asynchronous compilation
@@ -4813,6 +4825,7 @@ pi_result piPluginInit(pi_plugin *PluginInit) {
   _PI_CL(piProgramGetInfo, hip_piProgramGetInfo)
   _PI_CL(piProgramCompile, hip_piProgramCompile)
   _PI_CL(piProgramBuild, hip_piProgramBuild)
+  _PI_CL(piProgramLink, hip_piProgramLink)
   _PI_CL(piProgramGetBuildInfo, hip_piProgramGetBuildInfo)
   _PI_CL(piProgramRetain, hip_piProgramRetain)
   _PI_CL(piProgramRelease, hip_piProgramRelease)