[PATCH][gold] Mips: Correct the definition of _gp and _GLOBAL_OFFSET_TABLE_

[Vladimir Radosavljevic]

This patch corrects the definition of _gp and _GLOBAL_OFFSET_TABLE_ symbols.
With this patch, all _gp scope tests from GNU ld testsuite are passing.
Depends on https://sourceware.org/ml/binutils/2017-03/msg00146.html.

Regards,
Vladimir

ChangeLog -

	* mips.cc (symbol_refs_local): Return false if a symbol
	is from a dynamic object.
	(Target_mips::got_section): Make _GLOBAL_OFFSET_TABLE_ STV_HIDDEN.
	(Target_mips::set_gp): Refactor.  Make _gp STT_NOTYPE and
	STB_LOCAL.
	(Target_mips::do_finalize_sections): Set _gp after all the checks
	for creating .got are done.
	(Target_mips::Scan::global): Remove unused code.
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