* x86-64-tdep.c (amd64_register_info): Add %cs and %ss. Adjust

* x86-64-tdep.c (amd64_register_info): Add %cs and %ss.  Adjust
register numbers in comments.
* x86-64-tdep.h: Update copyright year.
(X86_64_ST0_REGNUM, X86_64_XMM0_REGNUM, X86_64_XMM1_REGNUM):
Adjust for addition of %cs and %ss.
* amd64fbsd-nat.c: Update copyright year.
(reg_offset): Add register offsets for %cs and %ss.
* amd64fbsd-tdep.c: Update copyright year.
(amd64fbsd_r_reg_offset): Add register offsets for %cs and %ss.
(amd64fbsd_sc_reg_offset): Likewise.
* x86-64-linux-nat.c: Update copyright year.
(x86_64_linux_gregset64_reg_offset): Add register offsets for %cs
and %ss.
* amd64nbsd-nat.c: Update copyright year.
(amd64nbsd32_r_reg_offset): Add register offsets for %cs and %ss.
* amd64nbsd-tdep.c: Update copyright year.
(amd64nbsd_r_reg_offset): Add register offsets for %cs and %ss.
* x86-64-linux-tdep.c: Update copyright year.
(user_to_gdb_regmap): Add mapping for %cs and %ss.
(x86_64_linux_sc_reg_offset): Adjust for addition of %cs and %ss.
* regformats/reg-x86-64.dat: Add %cs and %ss.