* config/mips/iris5gas.h (DWARF2_DEBUGGING_INFO): Define.
	(PREFERRED_DEBUGGING_TYPE): Use DWARF2_DEBUG.
	(LINK_SPEC): Define.
	(STARTFILE_SPEC): Define.
	(ENDFILE_SPEC): Define.

	* config/mips/iris6-o32.h (LINK_SPEC): Move ...
	* config/mips/iris6-o32-as.h (LINK_SPEC): ... here.

	* config/mips/iris6-o32-gas.h: New file.
	* config.gcc (mips-sgi-irix6*o32): Use it.

	* config/mips/t-iris5-gas: New file.
	* config.gcc (mips-sgi-irix6*o32, mips-sgi-irix5*): Use it.

From-SVN: r55596