Harlan Haskins 6ae20a959b [ParseableInterface] Refine cache key for cached swiftmodules ...

Previously, we included the PCH hash components in the cache key. While they didn’t do any harm, they didn’t contribute any unique information about the module in question.

Additionally, passing the effective language version in means that each dependency that uses a different -swift-version would re-compile all of its dependencies. This is unfortunate, as that means the standard library is recompiled potentially several times.

2019-02-04 14:39:46 -08:00

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