Doug Gregor 764f14807f [AST] Centralize the storage of the overridden declarations of a declaration. ...

Several kinds of declarations can override other declarations, but the
computation and storage for these “overridden” declarations was scattered in
at least 3 different places, with different resolution paths. Pull them
all together into two bits of LazySemanticInfo in ValueDecl (“have we computed
overrides?” and “are there any overrides?”), with a side table for the
actual list of overrides.

One side effect here is that the AST can now represent multiple overridden
declarations, although only associated type declarations track this
information.

Start using LazyResolver::resolveOverriddenDecl() more consistently, unifying
it with the separate path we had for associated type overrides. All of this
is staging for a move to the request-evaluator for overridden declaration
computation.

2018-07-02 14:51:28 -07:00

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