Date: 2008-06-20 11:15:32 -0700 (Fri, 20 Jun 2008)
Change generate_symbol to return an integer value, which indicates
whether there is any symbol generated. If there is no symbol, we
should not create .symtab and .strtab section at all.
For example, when all the symbol are removed from the symbol table,
symbol table itself needs to be removed.
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