It sounds like you're trying to link against an older Swift runtime while targeting a newer OS. swift_getTypeByMangledNameInContextInMetadataState was added in iOS 13.4 IIRC, and is not in older OS runtimes, nor is it in the Swift 5.0 runtime used for backward deployment to pre-Swift-ABI OSes. You shouldn't need to add the toolchain library paths to LIBRARY_SEARCH_PATHS yourself, because Xcode will automatically include those libraries if your minimum deployment target is old enough to need them.
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