Alex Hoppen 9dd87e9c4e [CodeCompletion] Fix ASAN failure when completing in parameter packs ...

Whe completing in parameter packs, we were calling `getParameterAt` with `Res.FuncDeclRef`. But the substitution map in `Res.FuncDeclRef` contained type variables that were allocated in the constraint system’s arena. And that arena had been freed when we call this from `deliverResults`.

The fix is to compute the optional parameters in advance in `sawSolutionImpl`

rdar://109093909

2023-05-10 15:24:19 -07:00

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