Erik Eckstein 810064b7dc Cleanup and additions to AST and SIL Type/CanonicalType ...

* factor out common methods of AST Type/CanonicalType into a `TypeProperties` protocol.
* add more APIs to AST Type/CanoncialType.
* move `MetatypeRepresentation` from SIL.Type to AST.Type and implement it with a swift enum.
* let `Builder.createMetatype` get a CanonicalType as instance type, because the instance type must not be a lowered type.

2025-03-07 15:59:33 +01:00

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