[SwiftLanguageRuntime] Cope with the case where we have multiple symbols
[SwiftLanguageRuntime] Cope with the case where we have multiple symbols

... when resolving addresses. If their value agree, we can just
pick one. This just adds a sanity check to make sure we don't
end up picking a random symbol instead of erroring out.

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb