PR 33020 segv in _bfd_elf_strtab_offset

PR 33020 segv in _bfd_elf_strtab_offset

The PR fuzzer testcase creates a SHT_NOBITS .debug_info section, then
triggers a bug in --compress-debug-sections=zlib whereby sh_name is
set to -1 in elf_fake_sections as a flag to indicate the name is not
set yet (may change to zdebug_*), but the section never hits the debug
compression code in assign_file_positions_for_non_load_sections that
is responsible for setting sh_name.

	PR 33020
	* elf.c (_bfd_elf_init_reloc_shdr): Rename delay_st_name_p
	param to delay_sh_name_p.
	(elf_fake_sections): Rename delay_st_name_p to delay_sh_name_p.
	Don't set delay_sh_name_p for no contents debug sections.