[SYCL] Clean-up lazy queue PI changes

* PI Minor version bump for new flag
* Document new PI property as comments
* Make value next consecutive bit `1 << 5`, rather
  than `1 << 11`.

sycl/include/sycl/detail/pi.h

@@ -52,9 +52,10 @@
 // 10.13 Added new PI_EXT_ONEAPI_QUEUE_DISCARD_EVENTS queue property.
 // 10.14 Add PI_EXT_INTEL_DEVICE_INFO_FREE_MEMORY as an extension for
 // piDeviceGetInfo.
+// 10.15 Add new PI_EXT_ONEAPI_QUEUE_LAZY_EXECUTION queue property
 
 #define _PI_H_VERSION_MAJOR 10
-#define _PI_H_VERSION_MINOR 14
+#define _PI_H_VERSION_MINOR 15
 
 #define _PI_STRING_HELPER(a) #a
 #define _PI_CONCAT(a, b) _PI_STRING_HELPER(a.b)
@@ -569,7 +570,14 @@ constexpr pi_queue_properties PI_QUEUE_PROFILING_ENABLE = (1 << 1);
 constexpr pi_queue_properties PI_QUEUE_ON_DEVICE = (1 << 2);
 constexpr pi_queue_properties PI_QUEUE_ON_DEVICE_DEFAULT = (1 << 3);
 constexpr pi_queue_properties PI_EXT_ONEAPI_QUEUE_DISCARD_EVENTS = (1 << 4);
-constexpr pi_queue_properties PI_EXT_ONEAPI_QUEUE_LAZY_EXECUTION = (1 << 11);
+// In a lazy queue, enqueued commands are not submitted for execution
+// immediately, instead they are submitted for execution once the queue is
+// flushed.
+//
+// This is to enable prototyping of the SYCL_EXT_ONEAPI_GRAPH extension,
+// before a native command-list interface in PI can be designed and
+// implemented.
+constexpr pi_queue_properties PI_EXT_ONEAPI_QUEUE_LAZY_EXECUTION = (1 << 5);
 
 using pi_result = _pi_result;
 using pi_platform_info = _pi_platform_info;

sycl/include/sycl/properties/queue_properties.hpp

@@ -28,7 +28,7 @@ namespace property {
 namespace queue {
 class discard_events
     : public ::sycl::detail::DataLessProperty<::sycl::detail::DiscardEvents> {};
-class lazy_execution 
+class lazy_execution
     : public ::sycl::detail::DataLessProperty<::sycl::detail::LazyExecution> {};
 } // namespace queue
 } // namespace property