[ARC] Fix local got entry list.

[ARC] Fix local got entry list.

Fix a memory leak appearing when the local got entry list was constructed.

bfd/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* arc-got.h (arc_get_local_got_ents): Revamp it; use
	elf_local_got_ents to store the local got list.
	(get_got_entry_list_for_symbo): Restructure it.
	* elf32-arc.c (elf_arc_relocate_section): Correct the call to
	get_got_entry_list_for_symbol.