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4763fd1a41
* Fix compile error for `zirErrorUnionType`.
* Convert zirMergeErrorSets logic to call `Type.errorSetMerge`.
It does not need to create a Decl as the TODO comment hinted.
* Extract out a function called `resolveInferredErrorSetTy`.
* Rework `resolvePeerTypes` with respect to error unions and
error sets. This is a less complex implementation that passes all the
same tests and uses many fewer lines of code by taking advantage of
the function `coerceInMemoryAllowedErrorSets`.
- Always merge error sets in the order that makes sense, even when
that means `@typeInfo` incompatibility with stage1.
* `Type.errorSetMerge` no longer overallocates.
* Don't skip passing tests.