Simplify: Take care with eta reduction in recursive RHSs (#21652)

Similar to the fix to #20836 in CorePrep, we now track the set of enclosing
recursive binders in the SimplEnv and SimpleOptEnv.
See Note [Eta reduction in recursive RHSs] for details.

I also updated Note [Arity robustness] with the insights Simon and I had in a
call discussing the issue.

Fixes #21652.

Unfortunately, we get a 5% ghc/alloc regression in T16577. That is due to
additional eta reduction in GHC.Read.choose1 and the resulting ANF-isation
of a large list literal at the top-level that didn't happen before (presumably
because it was too interesting to float to the top-level). There's not much we
can do about that.

Metric Increase:
    T16577

0 files changed, 0 insertions, 0 deletions