Hi

This patch is part of a series of patches to add support for Armv8.1-M 
Mainline instructions to binutils.
This adds infrastructure for the BF instructions which is one of the 
first instructions in Arm that
have more than one relocations in them.

This is the third infrastructure patch that adds a new relocation 
R_ARM_THM_BF16. Relocation specified in 
https://developer.arm.com/docs/ihi0044/latest/elf-for-the-arm-architecture-abi-2019q1-documentation#aaelf32-table4-9

The inconsistency between external R_ARM_THM_BF16 and internal 
BFD_RELOC_ARM_THUMB_BF17 is because internally we count the static bit-0 
of the immediate and we don't externally.

Testing: Builds successfully and no regressions.

Thanks
Sudi


ChangeLog entries are as follows :

*** bfd/ChnageLog ***

2019-04-04  Sudakshina Das  <sudi.das@arm.com>

	* reloc.c (BFD_RELOC_ARM_THUMB_BF17): New enum.
	* bfd-in2.h: Regenerated.
	* libbfd.h: Regenerated.
	* bfd-elf32-arm.c (elf32_arm_howto_table_1): New entry for R_ARM_THM_BF16.
	(elf32_arm_reloc_map elf32_arm_reloc_map): Map BFD_RELOC_ARM_THUMB_BF17
	and R_ARM_THM_BF16 together.
	(get_value_helper): New reloc helper.
	(elf32_arm_final_link_relocate): New switch case for R_ARM_THM_BF16.

*** elfcpp/ChangeLog ***

2019-04-04  Sudakshina Das  <sudi.das@arm.com>

	* arm.h (R_ARM_THM_BF16): New relocation code.

*** gas/ChangeLog ***

2019-04-04  Sudakshina Das  <sudi.das@arm.com>

	* config/tc-arm.c (md_pcrel_from_section): New switch case for
	BFD_RELOC_ARM_THUMB_BF17.
	(md_appdy_fix): Likewise.
	(tc_gen_reloc): Likewise.

*** include/ChangeLog ***

2019-04-04  Sudakshina Das  <sudi.das@arm.com>

	* elf/arm.h (START_RELOC_NUMBERS): New entry for R_ARM_THM_BF16.

*** opcodes/ChangeLog ***

2019-04-04  Sudakshina Das  <sudi.das@arm.com>

	* arm-dis.c (print_insn_thumb32): Updated to accept new %W pattern.