[AArch64] Fix function pointer variable with -Bsymbolic-functions

[AArch64] Fix function pointer variable with -Bsymbolic-functions

bfd/ChangeLog

2015-01-13 Thomas Preud'homme <thomas.preudhomme@arm.com>

    * elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Use
    SYMBOLIC_BIND to check if a symbol should be bound symbolically.

ld/testsuite/ChangeLog

2015-01-13 Thomas Preud'homme <thomas.preudhomme@arm.com>

    * ld-aarch64/aarch64-elf.exp: Added relocs-257-symbolic-func test.
    * ld-aarch64/relocs-257-symbolic-func.d: New file.
    * ld-aarch64/relocs-257-symbolic-func.s: Likewise.