[PATCH][gold] Implement R_AARCH64_NONE

[Igor Kudrin]

Hi,

This patch implements R_AARCH64_NONE relocation. According to "ELF for
the ARM(r) 64-bit Architecture (AArch64)", this relocation can be used
"to prevent removal of sections that might otherwise appear to be unused."

Best regards,
Igor Kudrin

---
gold/ChangeLog

	* aarch64-reloc.def (NONE): New relocation.
	* aarch64.cc (Target_aarch64::Scan::local): Handle R_AARCH64_NONE.
	(Target_aarch64::Scan::global): Likewise.
	* testsuite/Makefile.am (aarch64_reloc_none): New test.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/aarch64_reloc_none.s: New test source file.
	* testsuite/aarch64_reloc_none.sh: New test script.
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