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This change adds a new field to the ProcessStartInfo struct in UBA trace files for a description of the task, called "breadcrumbs" which allow to diagnose and backtrace the origin of a UBA task. This is also hooked up to the distributed shader compilation (added as new field in FTaskCommandData) and a descriptive string is generated for each shader compile job batch. UbaVisualizer is updated accordingly to integrate this new data when hovering over a task in the timeline. This feature can be enabled via the new CVar "r.ShaderCompiler.DistributedJobDescriptionLevel" with values 0 (Disabled), 1 (Basic information), 2 (Adds shader format to each job). It's disabled by default. #rb dan.elksnitis, henrik.karlsson #rnx [CL 36346831 by laura hermanns in 5.5 branch]