* configure.ac (gcc_cv_ld_aligned_shf_merge): New test.
	* configure: Regenerate.
	* config.in: Regenerate.
	* varasm.c (mergeable_string_section): Use readonly_data_section
	if linker doesn't support SHF_MERGE with alignment > 8.
	(mergeable_constant_section): Likewise.

From-SVN: r265456