Gas generated incorrect debug info (top-level DW_TAG_unspecified_type DIE)

Gas generated incorrect debug info (top-level DW_TAG_unspecified_type DIE)

	PR 29559
	* dwarf2dbg.c (out_debug_info): Place DW_TAG_unspecified_type at
	the end of the list of children, not at the start of the CU
	information.
	* testsuite/gas/elf/dwarf-3-func.d: Update expected output.
	* testsuite/gas/elf/dwarf-5-func-global.d: Likewise.
	* testsuite/gas/elf/dwarf-5-func-local.d: Likewise.
	* testsuite/gas/elf/dwarf-5-func.d: Likewise.