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perf: reduce instance priority of
Complex.instSMulRealComplex
(#12070)
See [here](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/simp.20prefers.20CharP.2Ecast_eq_zero.20over.20Nat.2Ecast_zero/near/432760180) on Zulip. We reduce the instance priority of `Complex.instSMulRealComplex` to 90. This leads to a very significant speed-up in two Modular Forms files (and still noticeable speed-ups in some other files).
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