Steven Wu 1325dd6a50 [Caching] Fix frontend cache replay for batch mode ...

Teach swift-frontend to correctly replay cache when using
batch-mode/primary-file. Currently, the cache replay logic will try to
look up cache key for all the inputs and only replay if all lookups are
successful. In batch-mode, not all inputs are producing outputs, which
causes lookup for those keys to be a miss and causing a false miss for
the compilation.

2023-12-01 09:59:38 -08:00

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