configure.ac: Check __mips64 when setting host_address.

configure.ac: Check __mips64 when setting host_address.

libgcc/
	* configure.ac: Check __mips64 when setting host_address.
	* configure: Regenerate.
	* config.host (mips*-*-*): Add t-softfp-sfdf, mips/t-softfp-tf,
	mips/t-mips64 and t-softfp.
	(mips*-*-linux*): Don't add mips/t-tpbit.
	* config/mips/t-mips (LIB2_SIDITI_CONV_FUNCS, FPBIT, FPBIT_CFLAGS)
	(DPBIT, DPBIT_CFLAGS): Delete.
	* config/mips/sfp-machine.h: New file.
	* config/mips/t-mips64: Likewise.
	* config/mips/t-softfp-tf: Likewise.
	* config/mips/t-tpbit: Delete.

From-SVN: r207403