Ben Barham 7cd4937290 [SourceKit] Disable cancellation of in-flight non-completion requests ...

We need to run SILGen for diagnostics (to actually get all diagnostics).
All non-completion requests share an AST and thus they too run SILGen.
Any lazy typechecking run in SILGen assumes that it succeeds.

Cancellation can cause typechecking to fail here though, since we simply
check the flag and error if it's set. This unfortunately has the ability
to cause any any number of crashes since various invariants in SILGen
are then broken.

Disable cancellation of in-flight non-completion requests for now until
we have a proper fix in place.

Resolves rdar://91251017.

2022-04-04 13:13:33 -07:00

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