Harlan Haskins 149367e5d5 [ParseableInterfaces] Short-circuit module loading ...

Previously, the ParseableInterfaceModuleLoader relied on the assumption
that, if it returned `errc::not_supported`, it would fall through the
search paths and then move on to the SerializedModuleLoader. This did
not anticipate the possibility of a valid .swiftinterface coming later
in the search paths, which can cause issues for the standard library
which is in the resource-dir and should always be loaded from there.

Instead, make the module loading explicitly short-circuit when seeing
`errc::not_supported`, and document it.

Also add some more logging throughout `discoverLoadableModule` so we can
more easily catch issues like this in the future.

Fixes rdar://49479386

2019-04-08 10:07:11 -07:00

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