[lldb] Forward declare SBPlatform and SBTypeMember in SBDefines

lldb/include/lldb/API/SBDefines.h

 class LLDB_API SBLaunchInfo;
 class LLDB_API SBLineEntry;
 class LLDB_API SBListener;
 class LLDB_API SBMemoryRegionInfo;
 class LLDB_API SBMemoryRegionInfoList;
 class LLDB_API SBModule;
 class LLDB_API SBModuleSpec;
 class LLDB_API SBModuleSpecList;
+class LLDB_API SBPlatform;
 class LLDB_API SBProcess;
 class LLDB_API SBProcessInfo;
 class LLDB_API SBQueue;
 class LLDB_API SBQueueItem;
 class LLDB_API SBSection;
 class LLDB_API SBSourceManager;
 class LLDB_API SBStream;
 class LLDB_API SBStringList;
 class LLDB_API SBStructuredData;
 class LLDB_API SBSymbol;
 class LLDB_API SBSymbolContext;
 class LLDB_API SBSymbolContextList;
 class LLDB_API SBTarget;
 class LLDB_API SBThread;
 class LLDB_API SBThreadCollection;
 class LLDB_API SBThreadPlan;
 class LLDB_API SBTrace;
 class LLDB_API SBTraceCursor;
 class LLDB_API SBType;
 class LLDB_API SBTypeCategory;
 class LLDB_API SBTypeEnumMember;
 class LLDB_API SBTypeEnumMemberList;
 class LLDB_API SBTypeFilter;
 class LLDB_API SBTypeFormat;
+class LLDB_API SBTypeMember;
 class LLDB_API SBTypeMemberFunction;
 class LLDB_API SBTypeNameSpecifier;
 class LLDB_API SBTypeSummary;
 class LLDB_API SBTypeSummaryOptions;
 class LLDB_API SBTypeSynthetic;
 class LLDB_API SBTypeList;
 class LLDB_API SBValue;
 class LLDB_API SBValueList;