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Return RunfilesProvider.EMPTY when both runfiles fields are the Runfiles.EMPTY singleton. Keep identity checks so other empty runfiles retain workspace and policy metadata. RELNOTES: None
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RunfilesProvider.EMPTYonly when both fields are theRunfiles.EMPTYsingleton, preserving workspace and policy metadata on other empty runfiles. This reduces our retained heap by 27MB - nothing to write home about, but also a fairly simple optimization.RELNOTES: None