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cmd/compile: avoid copying all values in nilcheckelim2 #20964
nilcheckelim2 cleans up by copying b.Values in a loop, omitting OpUnknowns. However, the common case is that there are no OpUnknowns, in which case we can skip a lot of work. This is a reminder issue to track whether there are any OpUnknowns and if so, skip the copying entirely.