FT32B is a new FT32 family member. It has a code compression scheme, which requires...

FT32B is a new FT32 family member. It has a code compression scheme, which requires the use of linker relaxations. The change is quite large, so submission is in several parts.

Part 2 adds a relaxation pass, which actually implements the code compression scheme.

bfd	* archures.c: Add bfd_mach_ft32b.
	* cpu-ft32.c: Add arch_info_struct.
	* elf32-ft32.c: Add R_FT32_RELAX, SC0, SC1,
	DIFF32. (ft32_elf_relocate_section): Add clauses
	for R_FT32_SC0, SC1, DIFF32.  (ft32_reloc_shortable,
	elf32_ft32_is_diff_reloc, elf32_ft32_adjust_diff_reloc_value,
	elf32_ft32_adjust_reloc_if_spans_insn,
	elf32_ft32_relax_delete_bytes, elf32_ft32_relax_is_branch_target,
	ft32_elf_relax_section): New function.
	* reloc.c: Add BFD_RELOC_FT32_RELAX, SC0, SC1, DIFF32.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.

gas	* config/tc-ft32.c (md_assemble): add relaxation reloc
	BFD_RELOC_FT32_RELAX.  (md_longopts): Add "norelax" and
	"no-relax". (md_apply_fix): Add reloc BFD_RELOC_FT32_DIFF32.
	(relaxable_section, ft32_validate_fix_sub, ft32_force_relocation,
	ft32_allow_local_subtract): New function.
	* config/tc-ft32.h: remove unused MD_PCREL_FROM_SECTION.
	* testsuite/gas/ft32/insnsc.s: New test exercising all FT32B
	shortcodes.

include	* elf/ft32.h: Add R_FT32_RELAX, SC0, SC1, DIFF32.