[lldb/API] Introduce SBOptional class

This class acts as a wrapper around other SB instances.

It makes use of `std::any` to store any kind of object and keeps that of
the type it was initialized with by storing a enum value for each type.

I was thinking using std::variant but ran into some issues when some
move-only SB types (i.e. SBStream).

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

Author: medismailben

lldb/bindings/interfaces.swig

@@ -132,6 +132,7 @@
 %include "lldb/API/SBModule.h"
 %include "lldb/API/SBModuleSpec.h"
 %include "lldb/API/SBMutex.h"
+%include "lldb/API/SBOptional.h"
 %include "lldb/API/SBPlatform.h"
 %include "lldb/API/SBProcess.h"
 %include "lldb/API/SBProcessInfo.h"

lldb/include/lldb/API/LLDB.h

@@ -51,6 +51,7 @@
 #include "lldb/API/SBModule.h"
 #include "lldb/API/SBModuleSpec.h"
 #include "lldb/API/SBMutex.h"
+#include "lldb/API/SBOptional.h"
 #include "lldb/API/SBPlatform.h"
 #include "lldb/API/SBProcess.h"
 #include "lldb/API/SBProcessInfo.h"

lldb/include/lldb/API/SBAddress.h

@@ -39,6 +39,8 @@ class LLDB_API SBAddress {
 
   void Clear();
 
+  SBOptional GetOptional();
+
   addr_t GetFileAddress() const;
 
   addr_t GetLoadAddress(const lldb::SBTarget &target) const;

lldb/include/lldb/API/SBDefines.h

@@ -90,6 +90,7 @@ class LLDB_API SBModule;
 class LLDB_API SBModuleSpec;
 class LLDB_API SBModuleSpecList;
 class LLDB_API SBMutex;
+class LLDB_API SBOptional;
 class LLDB_API SBPlatform;
 class LLDB_API SBPlatformConnectOptions;
 class LLDB_API SBPlatformShellCommand;