MFC r341511,r341512,r341513:
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().