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[UR] Improve handling of error cases in urProgramLink
Note that this change includes a specification change: urProgramLink now requires the output parameter to contain either nullptr or some unspecified binary on failure. As well as this change, a number of bugs have been fixed: * The Level Zero adapter now correctly returns `UR_RESULT_ERROR_PROGRAM_LINK_FAILURE` when linking fails, rather than `UR_RESULT_ERROR_UNKNOWN`. * A workaround has been added for some OpenCL devices that return `CL_INVALID_BINARY` rather than `CL_LINK_PROGRAM_FAILURE` on linker failure. * The `phProgram` handle is wrapped in a loader handle by the loader even if an error would be returned. This is required by Level Zero, which outputs a "dummy" program to store the linker log. Conformance tests have also been added.
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