[Backport releases/v4.18.0] fix: WellFounded preprocessing: use dsimp #7422
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This PR allows the use of `dsimp` during preprocessing of well-founded definitions. This fixes regressions when using `if-then-else` without giving a name to the condition, but where the condition is needed for the termination proof, in cases where that subexpression is reachable only by dsimp, but not by simp (e.g. inside a dependent let) Also fixes some preprocessing lemmas to not be bad simp lemmas (with lambdas on the LHS, due to dot notation and unfortunate argument order) This fixes #7408. (cherry picked from commit c797525)
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Backport c797525 from #7409.