2004-02-23 Andrew Stubbs <andrew.stubbs@superh.com>

2004-02-23  Andrew Stubbs <andrew.stubbs@superh.com>

gas:
	* tc-sh.c (build_Mytes): Add REG_N_D and REG_N_B01
	nibble types to assembler.
opcodes:
	* sh-dis.c (print_insn_sh): Add REG_N_D nibble type to
	ensure that double registers have even numbers.
	Add REG_N_B01 for nn01 (binary 01) nibble to ensure
	that reserved instruction 0xfffd does not decode the same
	as 0xfdfd (ftrv).
	* sh-opc.h: Add REG_N_D nibble type and use it whereever
	REG_N refers to a double register.
	Add REG_N_B01 nibble type and use it instead of REG_NM
	in ftrv.
	Adjust the bit patterns in a few comments.