In ActionExecutionFunction, delay construction of the skykey->artifact multimap used only for error processing until we know that it's required. As a result, don't unroll the all-inputs nested set until after we know all deps are present. Saves nested-set unrolling in the missing-dep+error-free case (up to 1/2 of all action executions) and saves iteration and multimap construction in the error-free case (~all actions). PiperOrigin-RevId: 366845997
{Fast, Correct} - Choose two
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