Create the framework for adding a thumb2 backend for ARM. So far, it...

src/SConscript

 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 88 matching lines @@
     utils.cc
     v8-counters.cc
     v8.cc
     v8threads.cc
     variables.cc
     version.cc
     virtual-frame.cc
     zone.cc
     """),
   'arch:arm': Split("""
-    arm/assembler-arm.cc
     arm/builtins-arm.cc
     arm/codegen-arm.cc
     arm/constants-arm.cc
     arm/cpu-arm.cc
     arm/debug-arm.cc
     arm/disasm-arm.cc
     arm/fast-codegen-arm.cc
     arm/frames-arm.cc
     arm/ic-arm.cc
     arm/jump-target-arm.cc
     arm/macro-assembler-arm.cc
     arm/regexp-macro-assembler-arm.cc
     arm/register-allocator-arm.cc
     arm/stub-cache-arm.cc
     arm/virtual-frame-arm.cc
     """),
+  'armvariant:arm': Split("""
+    arm/assembler-arm.cc
+    """),
+  'armvariant:thumb2': Split("""
+    arm/assembler-thumb2.cc
+    """),
   'arch:ia32': Split("""
     ia32/assembler-ia32.cc
     ia32/builtins-ia32.cc
     ia32/codegen-ia32.cc
     ia32/cpu-ia32.cc
     ia32/debug-ia32.cc
     ia32/disasm-ia32.cc
     ia32/fast-codegen-ia32.cc
     ia32/frames-ia32.cc
     ia32/ic-ia32.cc
@@ skipping 133 matching lines @@
       snapshot_cc = Command('snapshot.cc', [], [])
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot])
 
 
 (library_objs, d8_objs, mksnapshot) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot')