Fix thumb symbol value fixup in ObjectFileELF

[sas]

Summary

This is a cross-port of r235098 by Tamas Berghammer <[e-mail]>.

This patch fixes a critical bug in thumb symbol handling on ARM platforms.

lldb/branches/release_36/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp

for (i = 0; i < num_symbols; ++i)
                         symbol_section_sp = section_sp;
                     }
                 }
             }
         }
 
         // symbol_value_offset may contain 0 for ARM symbols or -1 for
         // THUMB symbols. See above for more details.
-        uint64_t symbol_value = symbol.st_value | symbol_value_offset;
+        uint64_t symbol_value = symbol.st_value + symbol_value_offset;
         if (symbol_section_sp && CalculateType() != ObjectFile::Type::eTypeObjectFile)
             symbol_value -= symbol_section_sp->GetFileAddress();
         bool is_global = symbol.getBinding() == STB_GLOBAL;
         uint32_t flags = symbol.st_other << 8 | symbol.st_info | additional_flags;
         bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false;
 
         Symbol dc_symbol(
             i + start_id,       // ID is the original symbol table index.