Expose a ImportPrivateDependencies LangOpt for LLDB (NFC). #75658
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This patch allows controlling the automatic import of private dependencies separately from the DebuggerSupport option, which currently also triggers this behavior. With explicit modules + precise compiler invocations LLDB is moving towards no longer needing this behavior.
rdar://133088201
Risk: This patch has no effect on the compiler itself and is only needed by the compiler that's embedded into LLDB.
Resolves: rdar://132360374
Testing: In LLDB.
Needed for swiftlang/llvm-project#9039.