./:	* common.opt: Add fmerge-debug-strings.
	* dwarf2out.c (DEBUG_STR_SECTION_FLAGS): Test
	flag_merge_debug_strings rather than flag_merge_constants.
	* doc/invoke.texi (Option Summary): Mention
	-fmerge-debug-strings.
	(Debugging Options): Document -fmerge-debug-strings.
testsuite/:
	* gcc.dg/debug/dwarf2/var1.c: Add -fno-merge-debug-strings.

From-SVN: r131630