llvm

28bcdb46 - [UR][L0V2] implement host-mediated buffer migration fallback (#22152)

[UR][L0V2] implement host-mediated buffer migration fallback (#22152) When two devices lack P2P access, getDevicePtr() was unconditionally throwing UR_RESULT_ERROR_UNSUPPORTED_FEATURE instead of migrating the buffer through a temporary host allocation. Implement the fallback: copy active-device -> host -> target device.