[lldb] Check runtime dependencies of SwiftREPL tests in local lit config #9421
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The SwiftREPL tests run
repl_swift.exe
, which manually loads a few external dependencies at runtime. In particular swiftCore.dll and swiftrt.obj.These binaries need to be in fixed locations and they only exists if the Swift runtime was built correctly. We cannot check them at configuration time, because they might not exist yet. It seems worth checking whether they exist and printing a warning otherwise, because the resulting test failures aren't very obvious.