[gold commit] Improve ODR checking in gold

[Cary Coutant]

I've committed the following patch to make ODR checking slightly more
fuzzy, to tolerate slight differences in line numbers that might
result from different compilers or different compile options.

-cary

gold/
        * debug.h (DEBUG_LOCATION): New.
        (DEBUG_ALL): Include DEBUG_LOCATION.
        (debug_string_to_enum): Add DEBUG_LOCATION.
        * dwarf_reader.cc (Sized_dwarf_line_info::read_lines): Fix debug
        output to print correct context.
        (Sized_dwarf_line_info::do_addr2line): Add debug output. Return
        up to 4 more locations at the beginning of the function.
        * symtab.cc (Symbol_table::detect_odr_violations): Get canonical
        result before sorting list of line numbers.
        * testsuite/debug_msg.sh: Allow range of line numbers for
        canonical results on optimized code.
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