Remove unused variable

[wttsugrii]

Summary

range_base variable is not used anywhere, so can be
safely removed.

[hhellyer]

Looks good, thanks.

[Eugene.Zelenko]

Committed in r280283.

source/Target/Process.cpp

 }
 
 Error
 Process::GetMemoryRegions (std::vector<lldb::MemoryRegionInfoSP>& region_list)
 {
 
     Error error;
 
-    lldb::addr_t range_base = 0;
     lldb::addr_t range_end = 0;
 
     region_list.clear();
     do
     {
         lldb::MemoryRegionInfoSP region_info( new lldb_private::MemoryRegionInfo() );
         error = GetMemoryRegionInfo (range_end, *region_info);
         // GetMemoryRegionInfo should only return an error if it is unimplemented.
         if (error.Fail())
         {
             region_list.clear();
             break;
         }
 
-        range_base = region_info->GetRange().GetRangeBase();
         range_end = region_info->GetRange().GetRangeEnd();
         if( region_info->GetMapped() == MemoryRegionInfo::eYes )
         {
             region_list.push_back(region_info);
         }
     } while (range_end != LLDB_INVALID_ADDRESS);
 
     return error;