[Patch, AArch64] Fix relocation bug related to ifunc handling

[Yufeng Zhang]

Hi,

The patch fixes an issue when relocating instructions where 
STT_GNU_IFUNC symbols are involved.  The back-end specific resolving 
function shall be called instead of the generic version, as some 
instructions like ADRP have multiple bit-fields to relocate.

OK to commit?

Thanks,
Yufeng


bfd/

	* elf64-aarch64.c (elf64_aarch64_final_link_relocate): Call
	aarch64_resolve_relocation and bfd_elf_aarch64_put_addend to
	handle the relocations of R_AARCH64_JUMP26, R_AARCH64_CALL26,
	R_AARCH64_LD64_GOT_LO12_NC, R_AARCH64_ADR_GOT_PAGE and
	R_AARCH64_GOT_LD_PREL19.

ld/testsuite/

	* ld-aarch64/aarch64-elf.exp: Add 'ifunc-7c'.
	* ld-aarch64/ifunc-7c.d: New test.
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