arm,sparc,x86,base,cpu,sim: Replace the Twin(32|64)_t types with.

Replace them with std::array<>s.

Change-Id: I76624c87a1cd9b21c386a96147a18de92b8a8a34
Reviewed-on: https://gem5-review.googlesource.com/6602
Maintainer: Gabe Black <gabeblack@google.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

src/base/SConscript

@@ -36,7 +36,6 @@ if env['CP_ANNOTATE']:
 SimObject('Graphics.py')
 Source('atomicio.cc')
 Source('bitfield.cc')
-Source('bigint.cc')
 Source('imgwriter.cc')
 Source('bmpwriter.cc')
 Source('callback.cc')