[Aarch64][binutils] Support id_mmfr4 system register.

[Matthew Wahab]

Hello,

The ARMv8 system registers include id_mmfr1 to id_mmfr4. The last
of these appears to have been omitted when support for ARMv8 was added to
binutils; this patch adds it.

Tested for aarch64-none-linux-gnu with check-gas and check-binutils.

Ok for trunk?
Matthew

opcodes/
2015-06-16  Matthew Wahab  <matthew.wahab@arm.com>

	* aarch64-opc.c (aarch64_sys_regs): Add "id_mmfr4_el1".

gas/testsuite
2015-06-16  Matthew Wahab  <matthew.wahab@arm.com>

	* sysreg.d: Add id_mmfr4_el1, update expected output.
	* sysreg.s: Add id_mmfr4_el1.
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