[SYCL][Docs] Add sycl_ext_oneapi_inter_process_communication (#20018)

This commit adds a new extension for inter-process communicable SYCL
object handles. As part of the initial version of this extension, only
inter-process communicable memory is exposed.

---------

Signed-off-by: Larsen, Steffen <[email protected]>
Co-authored-by: Greg Lueck <[email protected]>

Author: steffenlarsen

llvm/include/llvm/SYCLLowerIR/DeviceConfigFile.td

@@ -98,6 +98,7 @@ def Aspectext_oneapi_clock_sub_group : Aspect<"ext_oneapi_clock_sub_group">;
 def Aspectext_oneapi_clock_work_group : Aspect<"ext_oneapi_clock_work_group">;
 def Aspectext_oneapi_clock_device : Aspect<"ext_oneapi_clock_device">;
 def Aspectext_oneapi_is_integrated_gpu : Aspect<"ext_oneapi_is_integrated_gpu">;
+def Aspectext_oneapi_ipc_memory : Aspect<"ext_oneapi_ipc_memory">;
 
 // Deprecated aspects
 def AspectInt64_base_atomics : Aspect<"int64_base_atomics">;
@@ -176,7 +177,8 @@ def : TargetInfo<"__TestAspectList",
     Aspectext_oneapi_clock_sub_group,
     Aspectext_oneapi_clock_work_group,
     Aspectext_oneapi_clock_device,
-    Aspectext_oneapi_is_integrated_gpu],
+    Aspectext_oneapi_is_integrated_gpu,
+    Aspectext_oneapi_ipc_memory],
     []>;
 // This definition serves the only purpose of testing whether the deprecated aspect list defined in here and in SYCL RT
 // match.