* tc-mips.c (load_address): Use BFD_RELOC_MIPS_GOT_DISP for newabi.

	* tc-mips.c (load_address): Use BFD_RELOC_MIPS_GOT_DISP for newabi.
	(macro): Likewise for la.  Likewise for ld.
	(mips_after_parse_args): Make -xgot optional, not the default.
	(md_apply_fix3): Allow composite relocation to set up gp.
	(tc_gen_reloc): Allow relaxing for newabi.
	Relax R_MIPS_CALL16 to R_MIPS_GOT_PAGE/R_MIPS_GOT_OFST if local.
	Relax R_MIPS_GOT16/R_MIPS_LO16 to R_MIPS_GOT_DISP if local.