[binutils-gdb] Add support for the MRS instruction to the AArch64 simulator.

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT caa8d70005e4e12392683c799b30790fc4c62166 ***

Author: Nick Clifton <nickc@redhat.com>
Branch: master
Commit: caa8d70005e4e12392683c799b30790fc4c62166

Add support for the MRS instruction to the AArch64 simulator.

	* aarch64/simulator.c (system_get): New function.  Provides read
	access to the dczid system register.
	(do_mrs): New function - implements the MRS instruction.
	(dexSystem): Call do_mrs for the MRS instruction.  Halt on
	unimplemented system instructions.