[PATCH][gold] AArch64: Implement MOVW_UABS_* and MOVW_SABS_* relocations.

[Igor Kudrin]

Hi,

This patch implements R_AARCH64_MOVW_UABS_G* and R_AARCH64_MOVW_SABS_G*
relocations for AArch64 target.

Best regards,
Igor Kudrin

---
gold/ChangeLog

	* aarch64-reloc-property.cc (Rvalue_bit_select_impl): New class.
	(rvalue_bit_select): Use Rvalue_bit_select_impl.
	* aarch64-reloc.def (MOVW_UABS_G0, MOVW_UABS_G0_NC, MOVW_UABS_G1,
	MOVW_UABS_G1_NC, MOVW_UABS_G2, MOVW_UABS_G2_NC, MOVW_UABS_G3,
	MOVW_SABS_G0, MOVW_SABS_G1, MOVW_SABS_G2): New relocations.
	* aarch64.cc (Target_aarch64::Scan::local): Add cases for new
	MOVW_UABS_* and MOVW_SABS_* relocations.
	(Target_aarch64::Scan::global): Likewise.
	(Target_aarch64::Relocate::relocate): Add cases and handlings
	for new MOVW_UABS_* and MOVW_SABS_* relocations.
	* testsuite/Makefile.am (aarch64_relocs): New test.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/aarch64_globals.s: New test source file.
	* testsuite/aarch64_relocs.s: New test source file.
	* testsuite/aarch64_relocs.sh: New test script.
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