Fix in-memory section loading for JIT-ed code.

[ovyalov]

Summary

Debug sections for JIT-ed code are stored in-memory and loaded as part of module's image once __jit_debug_register_code is called -
if we cannot load a section by its base load address try to load it from in-memory data buffer if possible.

[tberghammer]

LGTM

[ovyalov]

Submitted as http://reviews.llvm.org/rL254638

source/Symbol/ObjectFile.cpp

if (IsInMemory())
                 {
                     section_data.SetData (data_sp, 0, data_sp->GetByteSize());
                     section_data.SetByteOrder (process_sp->GetByteOrder());
                     section_data.SetAddressByteSize (process_sp->GetAddressByteSize());
                     return section_data.GetByteSize();
                 }
             }
         }
+        return GetData(section->GetFileOffset(), section->GetFileSize(), section_data);
     }
     else
     {
         // The object file now contains a full mmap'ed copy of the object file data, so just use this
         return MemoryMapSectionData (section, section_data);
     }
     section_data.Clear();
     return 0;