Correct Nios II GOT pointer initialization.

2014-02-02  Sandra Loosemore  <sandra@codesourcery.com>

	bfd/
	* elf32-nios2.c (struct elf32_nios2_link_hash_table): Add
	h_gp_got field.
	(nios2_elf32_relocate_section): Use got_base to adjust
	GOT-pointer-relative relocations relative to _gp_got.
	(create_got_section): Create _gp_got symbol.
	(nios2_elf32_finish_dynamic_symbol): Make _gp_got absolute.
	(nios2_elf32_size_dynamic_sections): Set _gp_got offset.