[5.1] Look for runtime library modules in the SDK, too #23267
Merged
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Cherry-picks #23175 to swift-5.1-branch. This will need to be coordinated with apple/swift-lldb#1373.
Once module stability arrives, we'll want to load modules (and particularly parsable interfaces) from the SDK instead of the toolchain. This PR starts to stage that change in.
Resolves rdar://problem/46132288.