[LLDB] Reapply #100443 SBSaveCore Thread list (#104497)

Reapply #100443 and #101770. These were originally reverted due to a
test failure and an MSAN failure. I changed the test attribute to
restrict to x86 (following the other existing tests). I could not
reproduce the test or the MSAN failure and no repo steps were provided.

lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp

@@ -355,7 +355,7 @@ size_t ObjectFilePECOFF::GetModuleSpecifications(
 }
 
 bool ObjectFilePECOFF::SaveCore(const lldb::ProcessSP &process_sp,
-                                const lldb_private::SaveCoreOptions &options,
+                                lldb_private::SaveCoreOptions &options,
                                 lldb_private::Status &error) {
   // Outfile and process_sp are validated by PluginManager::SaveCore
   assert(options.GetOutputFile().has_value());