[PATCH][AARCH64] Fix TLS relocation resolution

[Sofiane Naci]

Hi,

This patch fixes a bug in the resolution of AArch64 TLS relocations
AARCH64_TLSLE_*_TPREL_*.
It also fixes wrong shift values for some of the AArch64 TLS relocations in
the howto tables.

Thanks
Sofiane

-----

ChangeLog:

	bfd/

	* elf64-aarch64.c (elf64_aarch64_tls_howto_table): Fix shift value
for
	R_AARCH64_TLSIE_LD_GOTTPREL_PREL19, R_AARCH64_TLSLE_MOVW_TPREL_G2,
	R_AARCH64_TLSLE_MOVW_TPREL_G1, R_AARCH64_TLSLE_MOVW_TPREL_G1_NC,
	R_AARCH64_TLSLE_ADD_TPREL_HI12.
	(elf64_aarch64_tlsdesc_howto_table): Fix shift value for
	R_AARCH64_TLSDESC_LD64_PREL19 and R_AARCH64_TLSDESC_OFF_G1.
	(elf64_aarch64_final_link_relocate): Add signed_addend when
resolving
	AARCH64_TLSLE_*_TPREL_* relocations.

	ld/testsuite/

	* ld-aarch64/tlsle-symbol-offset.s: New file.
	* ld-aarch64/tlsle-symbol-offset.d: New file.
	* ld-aarch64/aarch64-elf.exp: Add tlsle-symbol-offset test.
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