Handle Thumb-2 tail calls to PLT entries

[Nick Clifton]

Hi Daniel,

> 2007-07-30  Paul Brook  <paul@codesourcery.com>
> 
> 	* elf32-arm.c (elf32_arm_link_hash_entry): Add
> 	plt_maybe_thumb_refcount.
> 	(elf32_arm_link_hash_newfunc): Set plt_maybe_thumb_refcount.
> 	(elf32_arm_copy_indirect_symbol): Ditto.
> 	(elf32_arm_adjust_dynamic_symbol): Ditto.
> 	(bfd_elf32_arm_process_before_allocation): Handle R_ARM_THM_JUMP24.
> 	(arm_add_to_rel): Ditto.
> 	(elf32_arm_final_link_relocate): Merge R_ARM_THM_JUMP24 with
> 	R_ARM_THM_CALL.  Handle R_ARM_THM_JUMP19 against a PLT stub.
> 	(elf32_arm_gc_sweep_hook): Call check_use_blx.  Update plt counts
> 	for R_ARM_THM_JUMP24 and R_ARM_THM_JUMP19.
> 	(elf32_arm_check_relocs): Update plt counts for R_ARM_THM_JUMP24
> 	and R_ARM_THM_JUMP19.  
> 	(allocate_dynrelocs): Use plt_maybe_thumb_refcount.
> 	(elf32_arm_finish_dynamic_symbol): Ditto.
> 	(elf32_arm_output_plt_map): Ditto.

Approved - please apply.

Cheers
   Nick