r341511:
  Fix style(9). Not a functional change.
r341512:
  Implement arm64 version of __tls_get_addr().
r341513:
  Tidy up arm64 reloc_jmpslots() implementation.
  - don't relocate jump slots multiple times (if LD_BIND_NOW is defined).
  - process only R_AARCH64_JUMP_SLOT here, other relocation types are
    handled by reloc_plt().