llvm

bacad63d - [UR] Fix usm pools creation failure at context initialization (#20054)

[UR] Fix usm pools creation failure at context initialization (#20054) This is a cherry-pick of intel/llvm#19921 Context creation was failing when sub-sub-devices were exposed, because the Level Zero adapter attempted to add multiple USM pools with identical descriptors. This occurred since, for the L0 backend, sub-sub-devices and their parent sub-devices share the same Level Zero device handle and should use the same USM pool. This PR resolves the issue by ensuring only devices with unique Level Zero handles are collected for USM pool creation, preventing duplicate pools. Additionally, this PR fixes an issue with an uninitialized `ur_device_partition_property_t` variable passed to UR. Previously, this could result in an unexpected value for `value.affinity_domain` when the property type was `UR_DEVICE_PARTITION_BY_CSLICE` resulting on error from adapter. Patch-by: Artur Gainullin <artur.gainullin@intel.com>