Add MIPS r3 and r5 support.

Add MIPS r3 and r5 support.

This patch firstly adds support for mips32r3 mips32r5, mips64r3
and mips64r5.  Secondly it adds support for the eretnc instruction.

ChangeLog:

bfd/
	* aoutx.h (NAME (aout, machine_type)): Add mips32r3, mips64r3,
	mips32r5 and mips64r5.
	* archures.c (bfd_architecture): Likewise.
	* bfd-in2.h (bfd_architecture): Likewise.
	* cpu-mips.c (arch_info_struct): Likewise.
	* elfxx-mips.c (mips_set_isa_flags): Likewise.

gas/
	* tc-mips.c (ISA_SUPPORTS_MIPS16E): Add mips32r3, mips32r5, mips64r3
	and mips64r5.
	(ISA_HAS_64BIT_FPRS): Likewise.
	(ISA_HAS_ROR): Likewise.
	(ISA_HAS_ODD_SINGLE_FPR): Likewise.
	(ISA_HAS_MXHC1): Likewise.
	(hilo_interlocks): Likewise.
	(md_longopts): Likewise.
	(ISA_HAS_64BIT_REGS): Add mips64r3 and mips64r5.
	(ISA_HAS_DROR): Likewise.
	(options): Add OPTION_MIPS32R3, OPTION_MIPS32R5, OPTION_MIPS64R3, and
	OPTION_MIPS64R5.
	(mips_isa_rev): Add support for mips32r3, mips32r5, mips64r3 and
	mips64r5.
	(md_parse_option): Likewise.
	(s_mipsset): Likewise.
	(mips_cpu_info_table): Add entries for mips32r3, mips32r5, mips64r3
	and mips64r5.  Also change p5600 entry to be mips32r5.
	* configure.in: Add support for mips32r3, mips32r5, mips64r3 and
	mips64r5.
	* configure: Regenerate.
	* doc/c-mips.texi: Document the -mips32r3, -mips32r5, -mips64r3 and
	-mips64r5 command line options.
	* doc/as.texinfo: Likewise.

gas/testsuite/
	* gas/mips/mips.exp: Add MIPS32r5 tests.  Also add the mips32r3,
	mips32r5, mips64r3 and mips64r5 isas to the testsuite.
	* gas/mips/r5.s: New test.
	* gas/mips/r5.d: Likewise.

include/opcode/
	* mips.h (INSN_ISA_MASK): Updated.
	(INSN_ISA32R3): New define.
	(INSN_ISA32R5): New define.
	(INSN_ISA64R3): New define.
	(INSN_ISA64R5): New define.
	(INSN_ISA64, INSN_ISA64R2, INSN_ISA3_32, INSN_ISA3_32R2, INSN_ISA4_32
	INSN_ISA4_32R2, INSN_ISA5_32R2): Renumbered.
	(mips_isa_table): Add entries for mips32r3, mips32r5, mips64r3 and
	mips64r5.
	(INSN_UPTO32R3): New define.
	(INSN_UPTO32R5): New define.
	(INSN_UPTO64R3): New define.
	(INSN_UPTO64R5): New define.
	(ISA_MIPS32R3): New define.
	(ISA_MIPS32R5): New define.
	(ISA_MIPS64R3): New define.
	(ISA_MIPS64R5): New define.
	(CPU_MIPS32R3): New define.
	(CPU_MIPS32R5): New define.
	(CPU_MIPS64R3): New define.
	(CPU_MIPS64R5): New define.

opcodes/
	* mips-opc.c (mips_builtin_opcodes): Add MIPS32r5 eretnc instruction.
	(I34): New define.
	(I36): New define.
	(I66): New define.
	(I68): New define.
	* mips-dis.c (mips_arch_choices): Add mips32r3, mips32r5, mips64r3 and
	mips64r5.
	(parse_mips_dis_option): Update MSA and virtualization support to
	allow mips64r3 and mips64r5.