[UR][L0] Release parent of sub-buffer when sub-buffer dies

This commit fixes an issue where the sub-buffer object in the L0 V1 adapter would not release its retained parent, causing leaks.

Signed-off-by: Neil R. Spruit <[email protected]>

Author: nrspruit

source/adapters/level_zero/memory.cpp

@@ -1686,6 +1686,11 @@ ur_result_t urMemRelease(
   return UR_RESULT_SUCCESS;
 }
 
+_ur_buffer::~_ur_buffer() {
+  if (isSubBuffer())
+    ur::level_zero::urMemRelease(SubBuffer->Parent);
+}
+
 ur_result_t urMemBufferPartition(
     ur_mem_handle_t
         Buffer,           ///< [in] handle of the buffer object to allocate from

source/adapters/level_zero/memory.hpp

@@ -116,6 +116,8 @@ struct _ur_buffer final : ur_mem_handle_t_ {
     Parent->RefCount.increment();
   }
 
+  ~_ur_buffer();
+
   // Interop-buffer constructor
   _ur_buffer(ur_context_handle_t Context, size_t Size,
              ur_device_handle_t Device, char *ZeMemHandle, bool OwnZeMemHandle);