[arm] branches to weak symbols

[Nathan Sidwell]

Alan Modra wrote:

> I don't believe this is correct.  The default TC_FORCE_RELOCATION*
> macros should avoid applying relocations against weak symbols.  See
> generic_force_reloc and S_FORCE_RELOC.

ok, unfortunately arm_force_relocation is doing something funky with weak 
symbols in some cases, so the obvious changes don't DTRT.  We'll investigate 
further.

nathan

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