Ben Barham a6c8bf3818 [Frontend] Diagnose rather than exit/assert on experimental features ...

Diagnose rather than exit when using experimental features that cannot
be enabled in production. Also diagnose if using a compiler without
`SwiftCompilerSources` when enabling embedded.

This is especially important for long-running services like sourcekitd,
which shouldn't exit just because an invalid argument was passed.

Resolves rdar://119724074.

2024-01-02 12:49:08 -08:00

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