gas/

gas/
	* config/tc-mips.c (reloc_needs_lo_p): New function.
	(fixup_has_matching_lo_p): New function.
	(append_insn): Use reloc_needs_lo_p to check whether a relocation
	might need a matching %lo().  Reuse the head of mips_hi_fixup_list
	if that fixup already has a matching %lo().  Don't call frag_wane here.
	(macro): Call frag_wane here if the last unmatched hi was in the
	current frag.
	(pic_need_relax): New function, split out from...
	(md_estimate_size_before_relax): ...here.
	(mips_frob_file): Use reloc_needs_lo_p.  Use pic_need_relax to test
	whether BFD_RELOC_MIPS_GOT16 fixups refer to global symbols.

gas/testsuite/
	* gas/mips/rel12.[sd], gas/mips/rel13.[sd]: New tests.
	* gas/mips/mips.exp: Run them.