[Aarch64][binutils][2.25] Backport 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 backports to binutils-2.25 support for id_mmfr4.

The trunk change is at https://sourceware.org/ml/binutils/2015-06/msg00163.html
The commit log is at 
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=bdfa8b951ba38b15487eab2a754b9a33b9f29634

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

Ok for the branch?
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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