Merge bfd_find_nearest_line variants

Merge bfd_find_nearest_line variants

When bfd_find_nearest_line_discriminator was added, not enough care
was taken to ensure all targets had a proper definition of the function.
This patch cures that by merging bfd_find_nearest_line_discriminator
and bfd_find_nearest_line target implementations.

	PR 17481
	* aoutx.h (NAME (aout, find_nearest_line)): Add "discriminator_ptr"
	param, group "section" and "offset" params.  Zero discriminator.
	* bfd.c (bfd_find_nearest_line): Implement with new
	_bfd_find_nearest_line.
	(bfd_find_nearest_line_discriminator): Likewise.
	* coff-i386.c (_bfd_generic_find_nearest_line_discriminator): Don't
	define.
	* coff-rs6000.c (xcoff_find_nearest_line,
	xcoff_find_nearest_line_discriminator): Delete.
	(_bfd_xcoff_find_nearest_line): Don't define.
	(_bfd_xcoff_find_nearest_line): Define as coff_find_nearest_line.
	* coff-x86_64.c (_bfd_generic_find_nearest_line_discriminator): Don't
	define.
	* coff64-rs6000.c (rs6000_xcoff64_vec, rs6000_xcoff64_aix_vec): Adjust.
	* coffgen.c (coff_find_nearest_line_with_names): Reorder params,
	adjust _bfd_dwarf2_find_nearest_line call.
	(coff_find_nearest_line): Add "discriminator_ptr" param, reorder
	others.  Set discriminator.  Adjust call.
	(coff_find_nearest_line_discriminator): Delete.
	* dwarf1.c (_bfd_dwarf1_find_nearest_line): Reorder params.
	* dwarf2.c (find_line): Rename to..
	(_bfd_dwarf2_find_nearest_line): ..this, reordering params.
	Simplify setting of do_line.  Delete old function.
	(_bfd_dwarf2_find_line): Delete.
	* ecoff.c (_bfd_ecoff_find_nearest_line): Reorder params, add
	discriminator_ptr and set it.
	* elf-bfd.h (_bfd_elf_find_nearest_line): Update prototype.
	(_bfd_elf_find_nearest_line_discriminator): Delete.
	(_bfd_elf_find_line_discriminator): Delete.
	(_bfd_generic_find_nearest_line_discriminator): Don't define.
	* elf.c (elf_find_function): Reorder params.
	(_bfd_elf_find_nearest_line): Reorder params, add discriminator_ptr.
	Adjust calls.
	(_bfd_elf_find_nearest_line_discriminator): Delete.
	(_bfd_elf_find_line): Adjust call.
	* elf32-arm.c (arm_elf_find_function): Reorder params.
	(elf32_arm_find_nearest_line): Reorder params, add discriminator_ptr.
	Adjust calls.
	* elf64-alpha.c (elf64_alpha_find_nearest_line): Similarly.
	* elfnn-aarch64.c (aarch64_elf_find_function): Reorder params.
	(elfNN_aarch64_find_nearest_line): Reorder params, add
	discriminator_ptr.  Adjust calls.
	* elfxx-mips.c (_bfd_mips_elf_find_nearest_line): Similarly.
	* elfxx-mips.h (_bfd_mips_elf_find_nearest_line): Update prototype.
	* libaout.h (NAME (aout, find_nearest_line)): Update prototype.
	* libbfd-in.h (_bfd_nosymbols_find_nearest_line): Update.
	(_bfd_dwarf1_find_nearest_line): Likewise.
	(_bfd_dwarf2_find_nearest_line): Likewise.
	(_bfd_dwarf2_find_line): Delete.
	(_bfd_generic_find_nearest_line_discriminator): Delete.
	* libbfd.c (_bfd_generic_find_nearest_line_discriminator): Delete.
	* libcoff-in.h (coff_find_nearest_line): Update prototype.
	(coff_find_nearest_line_discriminator): Delete.
	(coff_find_nearest_line_with_names): Update prototype.
	* libecoff.h (_bfd_ecoff_find_nearest_line): Update prototype.
	* mach-o.c (bfd_mach_o_find_nearest_line): Reorder params, add
	discriminator_ptr.  Adjust calls.
	* mach-o.h (bfd_mach_o_find_nearest_line): Update prototype.
	* pdp11.c (NAME (aout, find_nearest_line)): Reorder params, add
	discriminator_ptr and set.
	* som.c (som_find_nearest_line): Similarly.
	* targets.c (BFD_JUMP_TABLE_SYMBOLS): Delete entry for
	_bfd_find_nearest_line_discriminator.
	(struct bfd_target <_bfd_find_nearest_line>): Adjust prototype.
	(struct bfd_target <_bfd_find_nearest_line_discriminator>): Delete.
	* vms-alpha.c (_bfd_vms_find_nearest_dst_line): Rename to..
	(_bfd_vms_find_nearest_line): ..this.  Reorder params, add
	"discriminator" and set.
	(_bfd_vms_find_nearest_line_discriminator): Delete.
	(_bfd_generic_find_nearest_line_discriminator): Don't define.
	(alpha_vms_find_nearest_line): Update define.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.
	* libcoff.h: Regenerate.