arch-arm: Add initial support for SVE contiguous loads/stores

Thanks to Pau Cabre and Adria Armejach Sanosa for their contribution
of bugfixes.

Change-Id: If8983cf85d95cddb187c90967a94ddfe2414bc46
Signed-off-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/13519
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>

src/arch/arm/SConscript

@@ -61,6 +61,7 @@ if env['TARGET_ISA'] == 'arm':
     Source('insts/pseudo.cc')
     Source('insts/static_inst.cc')
     Source('insts/sve.cc')
+    Source('insts/sve_mem.cc')
     Source('insts/vfp.cc')
     Source('insts/fplib.cc')
     Source('insts/crypto.cc')