rfl tactic extension for reflexive relations

This extends the rfl tactic so that it works on reflexive relations other than =, provided the reflexivity lemma has been marked as @[refl].

def Lean.Elab.Tactic.Rfl.evalApplyRfl : Tactic

This tactic applies to a goal whose target has the form x ~ x, where ~ is a reflexive relation, that is, a relation which has a reflexive lemma tagged with the attribute [refl].

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