arch-arm,cpu: Add initial support for Arm SVE

This changeset adds initial support for the Arm Scalable Vector Extension
(SVE) by implementing:
- support for most data-processing instructions (no loads/stores yet);
- basic system-level support.

Additional authors:
- Javier Setoain <javier.setoain@arm.com>
- Gabor Dozsa <gabor.dozsa@arm.com>
- Giacomo Travaglini <giacomo.travaglini@arm.com>

Thanks to Pau Cabre for his contribution of bugfixes.

Change-Id: I1808b5ff55b401777eeb9b99c9a1129e0d527709
Signed-off-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/13515
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

src/arch/arm/SConscript

@@ -1,6 +1,6 @@
 # -*- mode:python -*-
 
-# Copyright (c) 2009, 2012-2013, 2018 ARM Limited
+# Copyright (c) 2009, 2012-2013, 2017-2018 ARM Limited
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -60,6 +60,7 @@ if env['TARGET_ISA'] == 'arm':
     Source('insts/pred_inst.cc')
     Source('insts/pseudo.cc')
     Source('insts/static_inst.cc')
+    Source('insts/sve.cc')
     Source('insts/vfp.cc')
     Source('insts/fplib.cc')
     Source('insts/crypto.cc')