Add scheduling for M51xx core family.

Add scheduling for M51xx core family.

gcc/
	* config/mips/m5100.md: New file.
	* config/mips/mips-cpus.def (m5100, m5101): Define.
	* config/mips/mips-tables.opt: Regenerate.
	* config/mips/mips.c (mips_rtx_cost_data): Add costs for m5100.
	* config/mips/mips.h (MIPS_ISA_LEVEL_SPEC): Map -march=m5100 and
	-march=m5101 to -mips32r5.
	(MIPS_ARCH_FLOAT_SPEC): Map -m5101 to -msoft-float.
	(MIPS_ISA_NAN2008_SPEC): Map -march=m51* to -mnan=2008 if
	!-msoft-float.
	* config/mips/mips.md: Include m5100.md.
	(processor): Add m5100.
	* doc/invoke.texi (-march=@var{arch}): Add m5100, m5101.

From-SVN: r226066