Add support to show the symbolic names of the MIPS CP1 registers.

Add support to show the symbolic names of the MIPS CP1 registers.

2013-12-16  Andrew Bennett  <andrew.bennett@imgtec.com>

	gas/testsuite/gas/mips/
	* mips.exp: Add CP1 register name tests.
	* cp1-names-mips32.d: New test.
	* cp1-names-mips32r2.d: New test.
	* cp1-names-mips64.d: New test.
	* cp1-names-mips64r2.d: New test.
	* cp1-names-numeric.d: New test.
	* cp1-names-r3000.d: New test.
	* cp1-names-r4000.d: New test.
	* cp1-names-sb1.d: New test.
	* cp1-names.s: New test.
	* micromips-insn32.d: Add the correct symbolic names for the CP1
	registers.
	* micromips-noinsn32.d: Likewise.
	* micromips-trap.d: Likewise.
	* micromips.d: Likewise.

	opcodes/
	* mips-dis.c: Add mips_cp1_names pointer.
	(mips_cp1_names_numeric): New array.
	(mips_cp1_names_mips3264): New array.
	(mips_arch_choice): Add cp1_names.
	(mips_arch_choices): Add relevant cp1 register name array to each of
	the elements.
	(set_default_mips_dis_options): Add support for setting up the
	mips_cp1_names pointer.
	(parse_mips_dis_option): Add support for the cp1-names command line
	variable.  Also setup the mips_cp1_names pointer.
	(print_reg): Print out name of the cp1 register.