Add big-endian support for tilegx.

Add big-endian support for tilegx.

bfd/
	* config.bfd (tilegx-*-*): rename little endian vector; add big
	endian vector.
	(tilegxbe-*-*): New case.
	* configure.in (bfd_elf32_tilegx_vec): Rename...
	(bfd_elf32_tilegx_le_vec): ... to this.
	(bfd_elf32_tilegx_be_vec): New vector.
	(bfd_elf64_tilegx_vec): Rename...
	(bfd_elf64_tilegx_le_vec): ... to this.
	(bfd_elf64_tilegx_be_vec): New vector.
	* configure: Regenerate.
	* elf32-tilegx.c (TARGET_LITTLE_SYM): Rename.
	(TARGET_LITTLE_NAME): Ditto.
	(TARGET_BIG_SYM): Define.
	(TARGET_BIG_NAME): Define.
	* elf64-tilegx.c (TARGET_LITTLE_SYM): Rename.
	(TARGET_LITTLE_NAME): Ditto.
	(TARGET_BIG_SYM): Define.
	(TARGET_BIG_NAME): Define.
	* targets.c (bfd_elf32_tilegx_vec): Rename...
	(bfd_elf32_tilegx_le_vec): ... to this.
	(bfd_elf32_tilegx_be_vec): Declare.
	(bfd_elf64_tilegx_vec): Rename...
	(bfd_elf64_tilegx_le_vec): ... to this.
	(bfd_elf64_tilegx_be_vec): Declare.
	(_bfd_target_vector): Add / rename above vectors.

binutils/testsuite/
	* binutils-all/objdump.exp (cpus_expected): Add tilegx.

gas/
	* tc-tilegx.c (tilegx_target_format): Handle big endian.
	(OPTION_EB): Define.
	(OPTION_EL): Define.
	(md_longopts): Add entries for "EB" and "EL".
	(md_parse_option): Handle OPTION_EB and OPTION_EL.
	(md_show_usage): Add -EB and -EL.
	(md_number_to_chars): New.
	* tc-tilegx.h (TARGET_BYTES_BIG_ENDIAN): Guard definition with
	ifndef.
	(md_number_to_chars): Delete.
	* configure.tgt (tilegx*be): Handle.
	* doc/as.texinfo [TILE-Gx]: Document -EB and -EL.
	* doc/c-tilegx.texi: Ditto.

ld/
	* Makefile.am (ALL_EMULATION_SOURCES): Add eelf32tilegx_be.c.
	(ALL_64_EMULATION_SOURCES): Add eelf64tilegx_be.c.
	(eelf32tilegx_be.c): Add rule to build this file.
	(eelf64tilegx_be.c): Ditto.
	* Makefile.in: Regenerate.
	* configure.tgt (tilegx-*-*): Support big endian.
	(tilegxbe-*-*): New.
	* emulparams/elf32tilegx.sh (OUTPUT_FORMAT): Rename.
	(BIG_OUTPUT_FORMAT): Define.
	(LITTLE_OUTPUT_FORMAT): Define.
	* emulparams/elf32tilegx_be.sh: New.
	* emulparams/elf64tilegx.sh (OUTPUT_FORMAT): Rename.
	(BIG_OUTPUT_FORMAT): Define.
	(LITTLE_OUTPUT_FORMAT): Define.
	* emulparams/elf64tilegx_be.sh: New.

ld/testsuite/
	* ld-tilegx/reloc-be.d: New.
	* ld-tilegx/reloc-le.d: New.
	* ld-tilegx/reloc.d: Delete.
	* ld-tilegx/tilegx.exp: Test big and little endian.