Refactor fallback code to prepare for never type#88149

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rust-lang:masterfrom

Mark-Simulacrum:prep-never-type

Aug 21, 2021

Commits on Aug 19, 2021

factor fallback code into its own module

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introduce a `Diverging` enum instead of a bool

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shallow resolve target type in coercion

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cleanup: extract a helper for coercion from inference variables

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introduce a Coerce predicate

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Commits on Aug 20, 2021

move the `sub-unify` check and extend the documentation a bit

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create `Coercion` obligations given 2 unbound type variables

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move `fallback_if_possible` and friends to fallback.rs

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