[RFA] Perform relocations in dwarf2.c

[Michal Ludvig]

Daniel Berlin wrote:
>>  You shouldn't be casually deleting
>> code like this if you don't even know what platforms it is for.
>>
>> The list archives would be glad to tell you.
> 
> He's also removing the checks for what the standard specifically says is 
> the right thing.
> 
> If it doesn't work as is, something else is broken, as the code is correct.

It was related to these lines:

bfd/dwarf2.c (_bfd_dwarf2_find_nearest_line()):
    1924   if (addr_size == 0)
    1925     addr_size = 4;
    1926   BFD_ASSERT (addr_size == 4 || addr_size == 8);

 From bfd/elf.c (ie. on all platforms except arm, alpha and mips) this 
function is called with addr_size==0, it's then reinitialised to 4 - 
even on 64b systems. It's a little confusing to have addr_size==4 on 
x86-64, so I've "fixed" itby initialising to 
get_elf_backend_data(abfd)->s->arch_size/8 instead of 4 in case it was 0 
before.

Then the rest ceased to work for me, because offset_size was initialized 
to addr_size, ie. 8 on 64b archs, but should have been 4 to let the 
.debug_info parser work.

Now I've reverted this change and will follow the rule: "don't fix it 
unless it's broken" :-))

Michal Ludvig
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