[PATCH][AArch64] Improve copy relocation support on four absolute relocation types

[Nicholas Clifton]

Hi Jiong,

>    bfd/
>      * elfnn-aarch64.c (elfNN_aarch64_check_relocs): Initialize non_got_ref
>      properly for MOVW_G0/1/2_NC and MOVW_G3. Reject them when linking
>      shared library.
>      (elfNN_aarch64_gc_sweep_hook): Add check on these relocs.
>
>    ld/testsuite/
>      * ld-aarch64/copy-relocs-so.s: New test file.
>      * ld-aarch64/copy-relocs-exe.s: Likewise.
>      * ld-aarch64/copy-relocs.d: New expectation file.
>      * ld-aarch64/emit-relocs-264-bad.d: New test file.
>      * ld-aarch64/emit-relocs-266-bad.d: Likewise.
>      * ld-aarch64/emit-relocs-268-bad.d: Likewise.
>      * ld-aarch64/emit-relocs-269-bad.d: Likewise.
>      * ld-aarch64/aarch64-elf.exp: Run new added test.

Approved - please apply.

Cheers
   Nick