performance: optimize copy in allocateDebugMetadata

Signed-off-by: Brandon Yates <brandon.yates@intel.com>

Author: bmyates

shared/source/os_interface/linux/xe/ioctl_helper_xe_debugger.cpp

@@ -30,7 +30,7 @@ void *IoctlHelperXe::allocateDebugMetadata() {
     drm_xe_ext_vm_set_debug_metadata *prev = nullptr;
     drm_xe_ext_vm_set_debug_metadata *xeMetadataRoot = nullptr;
 
-    for (auto metadata : debugMetadata) {
+    for (auto &metadata : debugMetadata) {
         auto *xeMetadata = new drm_xe_ext_vm_set_debug_metadata();
         if (!xeMetadataRoot) {
             xeMetadataRoot = xeMetadata;