2018-01-11  Richard Biener  <rguenther@suse.de>
	Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	PR lto/81968
	libiberty/
	* simple-object-common.h (struct simple_object_functions):
	Change copy_lto_debug_sections callback signature.
	* simple-object-elf.c (SHN_HIRESERVE, SHT_SYMTAB_SHNDX,
	SHF_INFO_LINK): Add defines.
	(simple_object_elf_copy_lto_debug_sections): Instead of
	leaving not to be copied sections empty unnamed SHT_NULL
	remove them from the target section headers and adjust section
	reference everywhere.  Handle SHN_XINDEX in the symbol table
	processing properly.
	* simple-object.c (handle_lto_debug_sections): Change
	interface to return a modified string and handle renaming
	of relocation sections.

Co-Authored-By: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>

From-SVN: r256528