gdb/

gdb/
	Recognize missing DW_AT_location as <value optimized out>.
	* dwarf2read.c
	(new_symbol <DW_TAG_variable> <!DW_AT_location> <!DW_AT_external>):
	Call add_symbol_to_list.

gdb/testsuite/
	* gdb.dwarf2/dw2-noloc-main.c: New file.
	* gdb.dwarf2/dw2-noloc.S: New symbols matrix.
	(.text): Remove.
	(.data): New.
	(DW_AT_stmt_list, .debug_line, DW_AT_frame_base): Remove.
	(DW_AT_low_pc, DW_AT_high_pc): Reference `dw2-noloc-main.c'.
	(DW_TAG_subprogram func_cu1, noloc): Remove.
	(main): New.
	* gdb.dwarf2/dw2-noloc.exp: Use prepare_for_testing, compile also
	`dw2-noloc-main.c'.  Test the new DIEs from `dw2-noloc.S'.
	(file_symbols): New procedure.