[UR][NativeCPU] Mark IL_VERSION as optional query

unified-runtime/include/unified-runtime/ur_api.h

@@ -2203,7 +2203,9 @@ typedef enum ur_device_info_t {
   /// It is unsuitable for general use in applications. This feature is
   /// provided for identifying memory leaks.
   UR_DEVICE_INFO_REFERENCE_COUNT = 64,
-  /// [char[]] null-terminated IL version
+  /// [char[]][optional-query] null-terminated IL version. This query is
+  /// optional because not all adapters support intermediate language (IL). For
+  /// example, NativeCPU executes native code directly without IL support.
   UR_DEVICE_INFO_IL_VERSION = 65,
   /// [char[]] null-terminated device name
   UR_DEVICE_INFO_NAME = 66,

unified-runtime/scripts/core/device.yml

@@ -334,7 +334,7 @@ etors:
             The reference count returned should be considered immediately stale.
             It is unsuitable for general use in applications. This feature is provided for identifying memory leaks.
     - name: IL_VERSION
-      desc: "[char[]] null-terminated IL version"
+      desc: "[char[]][optional-query] null-terminated IL version. This query is optional because not all adapters support intermediate language (IL). For example, NativeCPU executes native code directly without IL support."
     - name: NAME
       desc: "[char[]] null-terminated device name"
     - name: VENDOR

unified-runtime/test/conformance/device/urDeviceGetInfo.cpp

@@ -1112,9 +1112,9 @@ TEST_P(urDeviceGetInfoTest, SuccessReferenceCount) {
                              property_value);
 }
 
+// Optional query: Not all adapters support intermediate language (IL).
+// NativeCPU executes native code directly without IL support.
 TEST_P(urDeviceGetInfoTest, SuccessILVersion) {
-  UUR_KNOWN_FAILURE_ON(uur::NativeCPU{});
-
   size_t property_size = 0;
   const ur_device_info_t property_name = UR_DEVICE_INFO_IL_VERSION;