Michael Gottesman 561662d6cc [sil] Add a new instruction called ThunkInst. ...

For now this will only be used for HopToMainActorIfNeeded thunks. I am creating
this now since in the past there has only been one option for creating
thunks... to create the thunk in SILGen using SILGenThunk. This code is hard to
test and there is a lot of it. By using an instruction here we get a few benefits:

1. We decouple SILGen from needing to generate new kinds of thunks. This means
that SILGenThunk does not need to expand to handle more thunks.

2. All thunks implemented via ThunkInst will be easy to test in a decoupled way
with SIL tests.

3. Even though this stabilizes the patient, we still have many thunks in SILGen
and various parts of the compiler. Over time, we can swap to this model,
allowing us to hopefully eventually delete SILGenThunk.

2024-10-02 14:15:49 -07:00

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