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312257688e
Introduce a NativeProcessProtocol API for indicating support for protocol extensions and enabling them. LLGS calls GetSupportedExtensions() method on the process factory to determine which extensions are supported by the plugin. If the future is both supported by the plugin and reported as supported by the client, LLGS enables it and reports to the client as supported by the server. The extension is enabled on the process instance by calling SetEnabledExtensions() method. This is done after qSupported exchange (if the debugger is attached to any process), as well as after launching or attaching to a new inferior. The patch adds 'fork' extension corresponding to 'fork-events+' qSupported feature and 'vfork' extension for 'vfork-events+'. Both features rely on 'multiprocess+' being supported as well. Differential Revision: https://reviews.llvm.org/D100153