[lldb] Assert that CommandObject::DoExecute sets a return status (#197796) Change the default value of CommandReturnObject::m_status from eReturnStatusStarted to eReturnStatusInvalid, and add a debug-only RAII check in CommandObjectParsed::Execute and CommandObjectRaw::Execute that asserts the status is no longer Invalid after DoExecute returns. This catches commands that forget to call SetStatus on a success or failure path. Succeeded() still returns true when the status is Invalid (0 sorts below eReturnStatusSuccessContinuingResult), so helpers that read result.Succeeded() as a precondition before any explicit SetStatus (e.g. StopProcessIfNecessary) continue to work. This is a re-land of #196589. rdar://176506732
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