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Introduce `Module.ensureFuncBodyAnalyzed` and corresponding `Sema` function. This mirrors `ensureDeclAnalyzed` except also waits until the function body has been semantically analyzed, meaning that inferred error sets will have been populated. Resolving error sets can now emit a "unable to resolve inferred error set" error instead of producing an incorrect error set type. Resolving error sets now calls `ensureFuncBodyAnalyzed`. Closes #11046. `coerceInMemoryAllowedErrorSets` now does a lot more work to avoid resolving an inferred error set if possible. Same with `wrapErrorUnionSet`. Inferred error set types no longer check the `func` field to determine if they are equal. That was incorrect because an inline or comptime function call produces a unique error set which has the same `*Module.Fn` value for this field. Instead we use the `*Module.Fn.InferredErrorSet` pointers to test equality of inferred error sets.