Re: Stop Gas from generating line info or address ranges

	* doc/as.texi (.nop): Document optional size arg.
	* dwarf2dbg.c (dwarf2_gen_line_info_1): Only check SEC_ALLOC
	when ELF.  Warn whenever dwarf line number information is ignored.
	* frags.c (frag_offset_ignore_align_p): New function.
	* frags.h (frag_offset_ignore_align_p): Declare.
	* read.c (s_nop): Extend to support optional size arg.
	* testsuite/gas/elf/dwarf2-20.d: Expect warnings, and exact range.
	* testsuite/gas/elf/dwarf2-20.s: Emit 16 bytes worth of nops.
	* testsuite/gas/m68hc11/indexed12.d: Expect warnings.