[3/6] Fix overcounting of ARM PLT references

[Nick Clifton]

Hi Richard,

> bfd/
> 	* elf32-arm.c (elf32_arm_check_relocs): Use call_reloc_p,
> 	may_need_local_target_p and may_become_dynamic_p to classify
> 	the relocation type.  Don't check info->symbolic or h->def_regular
> 	when deciding whether to record a potential dynamic reloc.
> 	Don't treat potential dynamic relocs as PLT references.
> 	(elf32_arm_gc_sweep_hook): Update to match.  Assert that we don't
> 	try to make the PLT reference count go negative.
>
> ld/testsuite/
> 	* ld-arm/arm-lib-plt-2a.s, ld-arm/arm-lib-plt-2b.s,
> 	ld-arm/arm-lib-plt-2.dd, ld-arm/arm-lib-plt-2.rd: New tests.
> 	* ld-arm/arm-elf.exp: Run them.

Approved - please apply.

Cheers
   Nick