[Frontend] Don't load modules from the prebuilt cache for private interfaces #36380
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The compiler shouldn't use a swiftmodule file from the prebuilt cache when a private swiftinterface is present. The prebuilt cache only has the public interfaces of modules. Instead, when loading modules with a private interface the compiler should use swiftmodules from the local cache, the one next to the swiftinterface or rebuild it, in that order.
rdar://73007024