Get rid of ARM_ELF_SYM_IS_THUMB flag.

[sas]

Summary

This was used with the old ARM vs. Thumb detection code but is not
required anymore.

lldb/trunk/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp

 }
 
 uint32_t
 ObjectFileELF::GetAddressByteSize() const
 {
     return m_data.GetAddressByteSize();
 }
 
-// Top 16 bits of the `Symbol` flags are available.
-#define ARM_ELF_SYM_IS_THUMB    (1 << 16)
-
 AddressClass
 ObjectFileELF::GetAddressClass (addr_t file_addr)
 {
     Symtab* symtab = GetSymtab();
     if (!symtab)
         return eAddressClassUnknown;
 
     // The address class is determined based on the symtab. Ask it from the object file what
for (i = 0; i < num_symbols; ++i)
                     {
                         // Subtracting 1 from the address effectively unsets
                         // the low order bit, which results in the address
                         // actually pointing to the beginning of the symbol.
                         // This delta will be used below in conjunction with
                         // symbol.st_value to produce the final symbol_value
                         // that we store in the symtab.
                         symbol_value_offset = -1;
-                        additional_flags = ARM_ELF_SYM_IS_THUMB;
                         m_address_class_map[symbol.st_value^1] = eAddressClassCodeAlternateISA;
                     }
                     else
                     {
                         // This address is ARM
                         m_address_class_map[symbol.st_value] = eAddressClassCode;
                     }
                 }