Orphan output section with multiple input sections

Orphan output section with multiple input sections

If given input sections with differing flags, we'd like to place the
section according to the final output section flags.

bfd/
	PR ld/19162
	* elflink.c (_bfd_elf_gc_mark_reloc): Move code iterating over
	linker input bfds..
	* section.c (bfd_get_next_section_by_name): ..to here.  Add ibfd param.
	(bfd_get_linker_section): Adjust bfd_get_next_section_by_name call.
	* tekhex.c (first_phase): Likewise.
	* elflink.c (bfd_elf_gc_sections): Likewise.
	* bfd-in2.h: Regenerate.
ld/
	PR ld/19162
	* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Check flags
	before calling _bfd_elf_match_sections_by_type.  Merge flags for
	any other input sections that might match a new output section to
	decide placement.