Name and seperate the union in gdbarch_info

Name and seperate the union in gdbarch_info

Add gdbarch_target_info as a new union. This will allow it to be
used directly as a parameter to functions in later patches.

2018-09-13  Alan Hayward  <alan.hayward@arm.com>

	* aarch64-linux-nat.c
	(aarch64_linux_nat_target::thread_architecture): Use target_info.
	* aarch64-tdep.c (aarch64_gdbarch_init): Likewise.
	* amd64-linux-tdep.c (amd64_linux_init_abi): Likewise.
	(amd64_x32_linux_init_abi): Likewise.
	* amd64-tdep.c (amd64_init_abi): Likewise.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Likewise.
	* gdbarch.sh (gdbarch_target_info): Add union
	(gdbarch_info): Use gdbarch_target_info.
	* i386-linux-tdep.c (i386_linux_init_abi): Use target_info.
	* i386-tdep.c (i386_gdbarch_init): Likewise.
	* mips-linux-tdep.c (mips_linux_init_abi): Likewise.
	* mips-tdep.c (mips_gdbarch_init): Likewise.
	* nds32-tdep.c (nds32_gdbarch_init): Likewise.
	* ppc-linux-tdep.c (ppu2spu_sniffer): Likewise.
	(ppc_linux_init_abi): Likewise.
	* rs6000-tdep.c (rs6000_gdbarch_init): Likewise.
	* s390-tdep.c (s390_gdbarch_init): Likewise.
	* sparc-tdep.c (sparc32_gdbarch_init): Likewise.
	* spu-multiarch.c (spu_gdbarch): Likewise.
	* spu-tdep.c (spu_gdbarch_init): Likewise.