Alex Hoppen 4107d02759 [SourceKit] Verify the stdlib is loaded before creating an AST ...

We have seen a couple of crashes that look like they are being caused by `sourcekitd` being unable to load the Swift stdlib. Emit a proper error message explaining the issue instead of crashing.

This change assumes that all sourcekitd requests that create an AST require the stdlib. IMHO this is a reasonable assumption.

Fixes rdar://75740572 by catching the crash in the new check.

2021-04-07 14:25:25 +02:00

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