[AArch64] LINK_SPEC changes for Cortex-A53 erratum 835769 workaround

    * config/aarch64/aarch64-elf-raw.h (CA53_ERR_835769_SPEC): Define.
    (LINK_SPEC): Include CA53_ERR_835769_SPEC.
    * config/aarch64/aarch64-linux.h (CA53_ERR_835769_SPEC): Define.
    (LINK_SPEC): Include CA53_ERR_835769_SPEC.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_9-branch@216979 138bc75d-0d04-0410-961f-82ee72b054a4