Detect cyclic subtype goals in new solver #110202
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Bubble up subtyping relations that become stalled so that the generalizer can eagerly detect cyclic responses to goals such as
?0 <: Box<?1>
when?0 <: ?1
is already a registered subtype obligation. Otherwise, processing these two in tandem will cause us to repeatedly substitute and get a runaway type.Fixes compiler-errors/next-solver-hir-issues#18
Opening for discussion mostly.