[gold][aarch64] PR gold/19987 - gold segfaults on R_AARCH64_LD64_GOTPAGE_LO15

[Han Shen]

Hi Cary, this patch for pr 19987 fixes / implements the
R_AARCH64_LD64_GOTPAGE_LO15.

Tested by running doit.sh provided by reporter. (Runtime test is not
done because even the provided "correct" binary crashed on my system.
Khen, are you able to test it?)

gold/ChangeLog:

    PR/19987.

    * aarch64-reloc.def: New relocation type.
    * aarch64.cc (AArch64_relocate_functions::Page): Changed to public.
    (Target_aarch64::Scan::local): Add R_AARCH64_LD64_GOTPAGE_LO15.
    (Target_aarch64::Scan::global): Add R_AARCH64_LD64_GOTPAGE_LO15.
    (Target_aarch64::Relocate::relocate): Implement R_AARCH64_LD64_GOTPAGE_LO15.

OK for trunk?

-Han
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