Slow readelf for huge ARM binary

[Dmitry Antipov]

I have a huge ARM v5 EABI binary with > 6.5M entries in .symtab and > 1.4M entries
in .ARM.exidx tables. With such a binary, 'readelf -u' wastes an (almost) infinite
amount of time doing linear search in find_symbol_for_address. IMHO this should be
fixed with some more advanced stuff, probably the ordered subset of .symtab with
STT_FUNC objects; an attached patch illustrates this idea (ARM-only).

Dmitry
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