Import patch to fix PR23919 from the mainline.
    
    	PR binutils/23919
    bfd	* bfd.c (bfd_update_compression_header): Explicitly set alignment.
    	(bfd_check_compression_header): Add uncompressed_alignment_power
    	argument. Check ch_addralign is a power of 2.
    	* bfd-in2.h: Regenerated.
    	* compress.c (bfd_compress_section_contents): Get and set
    	orig_uncompressed_alignment_pow if section is decompressed.
    	(bfd_is_section_compressed_with_header): Add and get
    	uncompressed_align_pow_p argument.
    	(bfd_is_section_compressed): Add uncompressed_align_power argument
    	to bfd_is_section_compressed_with_header call.
    	(bfd_init_section_decompress_status): Get and set
    	uncompressed_alignment_power.
    	* elf.c (_bfd_elf_make_section_from_shdr): Add
    	uncompressed_align_power argument to
    	bfd_is_section_compressed_with_header call.
    
    	* compress.c (bfd_is_section_compressed_with_header): Initialize
    	* uncompressed_align_pow_p to 0.
    
    binutils* readelf.c (dump_sections_as_strings): Remove bogus addralign check.
    	(dump_sections_as_bytes): Likewise.
    	(load_specific_debug_sections): Likewise.
    	* testsuite/binutils-all/dw2-3.rS: Adjust alignment.
    	* testsuite/binutils-all/dw2-3.rt: Likewise.
    
    gold	* merge.cc (Output_merge_string<Char_type>::do_add_input_section):
    	Get addralign from decompressed_section_contents.
    	* object.cc (build_compressed_section_map): Set info.addralign.
    	(Object::decompressed_section_contents): Add a palign
    	argument and store p->second.addralign in *palign if it isn't
    	NULL.
    	* object.h (Compressed_section_info): Add addralign.
    	(section_is_compressed): Add a palign argument, default it
    	to NULL, store p->second.addralign in *palign if it isn't NULL.
    	(Object::decompressed_section_contents): Likewise.
    	* output.cc (Output_section::add_input_section): Get addralign
    	from section_is_compressed.