Discard space for relocs against symbols with copy relocs

Discard space for relocs against symbols with copy relocs

This patch reverts the change in elf_x86_64_check_relocs and the partial
change in elf_x86_64_adjust_dynamic_symbol.  Instead, we discard space
in PIE for relocs against symbols which turn out to need copy relocs.

	* elf64-x86-64.c (elf_x86_64_check_relocs): Revert the last
	change.
	(elf_x86_64_adjust_dynamic_symbol): Don't check !info->shared
	with ELIMINATE_COPY_RELOCS.
	(elf_x86_64_allocate_dynrelocs): For PIE, discard space for
	relocs against symbols which turn out to need copy relocs.