Make record selection look cheap
exprIsCheap was already making record selection look cheap, esp for dictionary selection; e.g. (==) dEq The idea is to allow those record selections to migrate inside a lambda, because on the whole it's more expensive to share than repeat them. But sometimes dictionary selection is nested; e.g. (==) ($p1Num dNum) This turned out to make a (fragile) rewrite rule fire a little more robustly, but it seems like a good idea in any case. This patch makes nested record selections also look cheap.
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