Hamish Knight 92103a7c63 [AST] Remove SourceFile::addImports ...

Temporarily replace with `SourceFile::setImports`
until import resolution is requestified. Now
imports are only set once for a given SourceFile.

Because we're now asserting in more places that
import resolution must have run before querying
imports, this commit also adds
`getCachedUnderlyingType` to TypeAliasDecl to stop
the ASTDumper from trying to query imports for a
-dump-parse invocation.

2020-04-20 13:20:35 -07:00

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