config.gcc (mips-sgi-irix6.5*): Set tmake_file to mips/t-irix6 t-slibgcc-dummy.

config.gcc (mips-sgi-irix6.5*): Set tmake_file to mips/t-irix6 t-slibgcc-dummy.

	gcc:
	* config.gcc (mips-sgi-irix6.5*): Set tmake_file to mips/t-irix6
	t-slibgcc-dummy.
	* config/mips/irix-crti.asm: Move to ../libgcc/config/mips/irix-crti.S.
	* config/mips/irix-crtn.asm: Move to ../libgcc/config/mips/irix-crtn.S.
	* config/mips/t-iris: Remove.
	* config/mips/t-irix6: New file.
	* config/mips/t-slibgcc-irix: Move to ../libgcc/config/mips.

	libgcc:
	* config.host (mips-sgi-irix[56]*): Restrict to mips-sgi-irix6.5*.
	Set tmake_file, extra_parts.
	* config/mips/irix-crti.S: Move from ../gcc/config/mips/irix-crti.asm.
	Remove O32 support.
	* config/mips/irix-crtn.S: Move from ../gcc/config/mips/irix-crtn.asm.
	Remove O32 support.
	* config/mips/t-irix6: New file.
	* config/mips/t-slibgcc-irix: New file.

From-SVN: r174608