[PATCH][gold] Fix offset calculation when applying AArch64 TLSDESC relocations.

[Igor Kudrin]

Hi,

If a custom linker script with an unexpected relative layout of .got
and .got.plt sections was used, gold might produce a wrong offset
when applying R_AARCH64_TLSDESC_* relocations.

This patch fixes the issue by calculating "got_tlsdesc_offset"
in a more direct way.

Best regards,
Igor Kudrin
C++ Developer, Access Softek, Inc.

---
gold/ChangeLog

	* aarch64.cc (Target_aarch64::Relocate::relocate_tls):
	Make got_tlsdesc_offset signed and fix its calculation.
	* testsuite/Makefile.am (aarch64_tlsdesc): New test.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/aarch64_tlsdesc.s: New test source file.
	* testsuite/aarch64_tlsdesc.sh: New test script.
	* testsuite/aarch64_tlsdesc.t: New test linker script.
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