}
		bstart := s.bstart
		idToIdx := make([]int, f.NumBlocks())
		for i, b := range f.Blocks {
			idToIdx[b.ID] = i
		}
		// Register a callback that will be used later to fill in PCs into location
		// lists. At the moment, Prog.Pc is a sequence number; it's not a real PC
		// until after assembly, so the translation needs to be deferred.
		debugInfo.GetPC = func(b, v ssa.ID) int64 {
			switch v {
			case ssa.BlockStart.ID: